How to Buy a Mattress: The Ultimate Guide

Buying a mattress is one of the most consequential purchases most people make for their health — and one of the most confusing. You'll spend roughly a third of your life on it, yet the shopping process is often rushed, overwhelming, and filled with technical jargon designed more to confuse than to clarify. This guide cuts through the noise and gives you a clear, systematic process for finding the right mattress for your body, budget, and sleeping style.

01Step 1: Know Your Sleep Position

Before budget, before brand, before anything else — understand how you sleep. Your primary sleep position determines the firmness and support profile you need more than any other single factor. Get this wrong and no amount of premium materials will make up for it.

Side Sleepers (Most Common — ~63% of Adults)

Side sleeping creates high-pressure points at the shoulder and hip — the widest parts of your body that dig into the mattress. You need a surface soft enough to allow these areas to sink in while keeping the rest of your spine aligned. A mattress that's too firm creates pressure points; too soft and your spine curves laterally.

Best firmness: Soft to Medium (3–5 on a 10-point scale where 1 is softest)

Best materials: Memory foam and hybrid with plush top layers tend to work best

Back Sleepers (~18% of Adults)

Back sleeping is generally considered the most neutral position for spinal alignment. The challenge is the lumbar curve — the natural inward curve of the lower back needs support, not a gap. Too soft a mattress lets the hips sink too deep, flattening the lumbar curve; too firm leaves the lower back unsupported and suspended.

Best firmness: Medium to Medium-Firm (5–7)

Best materials: Memory foam, latex, and hybrid all work well

Stomach Sleepers (~7% of Adults)

Stomach sleeping is the most mechanically challenging position. When you sleep face-down, a soft mattress lets your hips sink lower than your torso, creating an exaggerated arch in the lumbar spine that can cause or worsen back discomfort. You need a mattress firm enough to keep your body relatively level.

Best firmness: Medium-Firm to Firm (6–8)

Best materials: Latex and hybrid with firm support cores; most memory foam is too conforming

Combination Sleepers (~12% of Adults)

If you move through multiple positions during the night, a mattress that responds well to position changes — neither too slow (like deep memory foam) nor too firm — works best. You need a balance that works reasonably well for multiple positions.

Best firmness: Medium (5–6)

Best materials: Hybrid or responsive latex that recovers quickly when you shift positions

For a detailed breakdown with body weight considerations, see our guide on how to choose mattress firmness.

02Step 2: Understand the Main Mattress Types

There are four primary mattress construction categories. Understanding what's inside the mattress helps you predict how it will feel and perform over time.

Innerspring

The traditional mattress. A steel coil support system topped with padding layers (foam, fiber, pillow top). Innersprings have been the industry standard for over a century and still represent a significant portion of mattress sales.

• Feel: Bouncy, responsive, classic "mattress feel." Sleeps cooler than all-foam.
• Best for: Combination sleepers, hot sleepers, those who prefer traditional feel, stomach sleepers
• Durability: Moderate — coils can develop "body impressions" over time; high-coil-count models last longer
• Price range: $300–$3,000+ (queen)
• Watch out for: Motion transfer (innersprings can be bouncy when a partner moves), edge support varies widely

Memory Foam

Viscoelastic polyurethane foam that softens with body heat, conforms to your shape, and slowly returns to its original form. Originally developed by NASA in the 1960s, memory foam mattresses became mainstream in the late 1990s and are now one of the most popular categories.

• Feel: Hugging, contouring, pressure-relieving. Slower response than innerspring or latex.
• Best for: Side sleepers, those with pressure point issues, light-sensitive sleepers (minimal motion transfer)
• Durability: Good — quality high-density foam holds up well; budget foam sags faster
• Price range: $300–$2,000 (queen)
• Watch out for: Heat retention (though gel/copper/open-cell formulations mitigate this); can feel restrictive when changing positions

Latex

Foam derived from rubber tree sap (natural latex) or synthesized (synthetic latex) or blended. Latex has a distinctly different feel from memory foam — more buoyant and responsive, with less "sink" and quicker recovery.

• Feel: Springy, responsive, pressure-relieving without the "trapped" feeling of memory foam
• Best for: Combination sleepers, hot sleepers (latex is naturally breathable), eco-conscious buyers (natural latex is renewable)
• Durability: Excellent — natural latex is one of the most durable mattress materials; 15+ year lifespans are realistic
• Price range: $800–$3,500 (queen) — higher cost reflects material quality
• Watch out for: Weight (latex is heavy); latex allergy (rare but real); higher price point

Hybrid

A combination of a pocketed coil support core (individually wrapped springs) topped with foam comfort layers (memory foam, latex, or both). Designed to deliver the support and airflow benefits of coils with the pressure relief of foam.

• Feel: Balanced — responsive enough for combination sleepers, conforming enough for side sleepers
• Best for: Most sleepers, couples with different preferences, hot sleepers who want foam feel without heat retention
• Durability: Good to excellent — pocketed coils are highly durable; foam layer quality determines longevity
• Price range: $600–$3,000+ (queen)
• Watch out for: Quality variance is high — a high-quality hybrid requires quality in both the coil system and the foam layers

03Step 3: Choose the Right Size

Mattress size involves practical constraints (room dimensions, budget, partner needs) and personal preferences (how much space you want when sleeping).

Standard Sizes and Who They're For

• Twin (38" × 75"): Children's rooms, single sleepers in small spaces, bunk beds. Limited for adults unless the room is very small.
• Twin XL (38" × 80"): Same width as twin, 5" longer. Standard for college dorms; good for tall single sleepers. Building block for split king configurations.
• Full/Double (54" × 75"): Adequate for single adults but tight for couples. 16" wider than twin — helpful for a single sleeper who moves around. At 75", shorter than ideal for taller adults.
• Queen (60" × 80"): The most popular size in the US. Comfortable for couples; generous for single sleepers. Fits well in most master bedrooms.
• King (76" × 80"): The widest standard size. Ideal for couples who want maximum personal space, or households with children/pets sharing the bed. Requires a bedroom of at least 12' × 12' for comfortable access.
• California King (72" × 84"): Narrower than standard king but 4" longer. For taller individuals (6'2"+) where length is the priority over width.

Practical Sizing Rules

Beyond preferences, measure your room. Standard guidance: leave at least 2 feet of clearance on each side and at the foot of the bed for comfortable navigation. In practice, this means a queen-size bed requires a bedroom of at least 10' × 11' for a reasonable feel, and a king needs at least 12' × 12'.

Couples sharing a bed should prioritize queen as the minimum. The difference between a full and a queen gives each partner approximately 3 more inches of personal space — which sounds small but makes a meaningful difference in sleep quality, particularly if either partner moves during the night.

For detailed size guidance with room dimension charts, see our guide on how to choose the best mattress size.

04Step 4: Nail Down Firmness

Firmness is the most commonly misunderstood mattress specification. The industry has standardized on a 1–10 scale (1 = plush/soft, 10 = extra firm), but individual perception of firmness varies — what feels "medium" to a 130-lb person feels "soft" to a 250-lb person.

The key variables that affect your ideal firmness:

• Sleep position (covered in Step 1)
• Body weight: Lighter sleepers (<130 lbs) generally need softer options; heavier sleepers (200+ lbs) need firmer options to prevent excessive sinkage
• Partner considerations: Couples with significantly different weights or position preferences benefit from medium options that compromise well, or split firmness if available
• Personal preference: Some people simply prefer the feeling of sleeping "on" a mattress vs. "in" it — this is valid and should factor in

Industry research from sleep studies consistently shows that medium-firm mattresses receive the highest satisfaction ratings across diverse sleepers, which is why they're the most commonly recommended default. But this is an average, not a prescription.

05Step 5: Evaluate Materials and Construction

Once you know your type and firmness range, dig into construction specifics. The mattress specifications that actually correlate with long-term quality:

Foam Density

For memory foam and polyfoam layers, density (measured in lbs/cubic foot) is the most reliable durability indicator. Look for:

• Comfort layers: 3.0 lb/cu ft or higher (memory foam); 1.8 lb/cu ft or higher (polyfoam)
• Support/base foam: 1.8 lb/cu ft or higher
• Budget mattresses often use 1.0–1.5 lb foam — softer initially but degrades much faster

Coil Count and Gauge (for Innerspring/Hybrid)

For pocketed coil systems, individual coil count matters — more coils generally means finer zoning and better motion isolation. A quality queen hybrid has 1,000–2,000+ pocketed coils. Coil gauge refers to wire thickness — lower gauge (thicker wire) means firmer and more durable coils. High-quality hybrids often use 13–15 gauge coils.

Cover Materials

The top cover affects feel and breathability. Quality covers use organic cotton, Tencel (lyocell), or wool. Budget mattresses typically use polyester — functional but less breathable and less durable.

Certifications

• CertiPUR-US: Certifies foam meets standards for emissions, content, and durability
• OEKO-TEX Standard 100: Tests all materials for harmful substances
• GOTS (Global Organic Textile Standard): For organic fabric components
• GOLS (Global Organic Latex Standard): For organic latex claims

06Step 6: Set a Realistic Budget

Mattress pricing is notoriously difficult to parse, but a few frameworks help:

Budget by Tier (Queen Size)

• Under $500: Entry-level foam. Adequate for guest rooms, children's rooms, or temporary situations. Expect 4–6 years before notable degradation. Limited durability and warranty coverage.
• $500–$900: Mid-range foam or basic hybrid. Improved foam density, better cover materials. Suitable as a primary mattress for budget-conscious buyers. 6–8 year lifespan realistic.
• $900–$1,500: Quality territory. Well-engineered foam or hybrid mattresses from reputable brands. Better coil systems, certified foams, quality covers. 8–12 year lifespan. This is where most people find the best value.
• $1,500–$2,500: Premium construction. Natural latex, high coil-count hybrids, organic certifications. Exceptional durability and performance. For those who want the best and plan to keep it 12+ years.
• $2,500+: Luxury territory. Diminishing returns for most buyers, but represents handcrafted construction, premium natural materials, and truly exceptional build quality.

The practical takeaway: diminishing returns become significant above $1,500 for most sleepers. A quality $1,000 hybrid will outperform a $3,000 traditional mattress for many people — not because of price but because the hybrid matches their specific needs better.

For a more detailed framework on mattress budgeting, see our guide on how much you should spend on a mattress.

07Step 7: Decide Where to Buy

The in-store vs. online decision is one of the most practically significant choices in the buying process. Both channels have genuine advantages.

In-Store Advantages

• You can test firmness and feel before buying — the most direct way to know if a mattress works for your body
• Expert staff can ask questions and guide you based on your sleep position, concerns, and preferences
• You can compare multiple options side-by-side in the same session
• White-glove delivery with old mattress removal is typically available
• Instant physical confidence — no uncertainty about what you're getting

Online Advantages

• More competitive pricing — direct-to-consumer model eliminates retail markup
• Extensive review resources, independent testing, and spec comparisons
• Generous trial periods (100–365 nights) reduce purchase risk
• Convenient delivery without scheduling constraints
• No sales pressure environment

The Hybrid Approach (Recommended)

Many experienced mattress shoppers do both: visit stores like LA Mattress to test different firmness levels and mattress types in person, establish their preferences, and then make a final purchase decision informed by that hands-on experience. This combines the sensory confidence of in-store testing with the full range of online research and comparison tools.

Browse the full LA Mattress mattress collection — our stores let you test any mattress before purchasing, with the full range of online options available for comparison.

For a comprehensive look at the in-store vs. online buying decision, see our guide on buying a mattress online vs in-store.

08Step 8: What to Actually Test In-Store

Most people spend 2–3 minutes bouncing on a mattress in a showroom — which is wildly insufficient for a purchase you'll sleep on for a decade. Here's how to actually evaluate a mattress in person:

Lie in Your Actual Sleep Position

Don't lie on your back to test a mattress if you're a side sleeper. Get on the mattress the way you actually sleep. Spend at least 5–10 minutes in position — it takes that long for your body to register pressure points and for the mattress to respond to your warmth and weight.

Check Spinal Alignment

Have a companion look at your spine from the side when you're in your sleep position. Your spine should be roughly straight (for side sleepers) or maintain its natural curves (for back sleepers) — not bowed or arched. If you're alone, notice whether you feel any unusual tension in your lower back, shoulders, or hips.

Test Edge Support

Sit on the edge of the mattress. If you sink dramatically, the mattress has poor edge support — which matters for couples (less usable sleeping area), for getting in and out of bed, and as a longevity indicator (edges that compress easily often develop faster body impressions).

Test Motion Isolation (for Couples)

If you share a bed, ask your partner to move around while you lie still. How much do you feel their movement? Memory foam and pocketed coil hybrids typically isolate motion well; traditional innerspring systems transfer more motion.

Try Adjustability (if considering an adjustable base)

If you're considering pairing with an adjustable base, test the mattress elevated. Some mattresses that feel good flat feel different at head/foot inclines.

09Step 9: Verify These Before Finalizing

Whether buying in-store or online, confirm these specifics before completing the purchase:

Trial Period

Understand the full trial terms: how long (100 nights minimum is now standard for online), when it starts (delivery date or first sleep), what the return process involves, and whether there's an adjustment period before returns are accepted (some brands require 30 nights).

Warranty

Read what's actually covered. A 10-year warranty means little if body impressions under 1.5" aren't covered — that depth of impression can significantly affect sleep quality long before it becomes dramatic. Quality brands cover impressions of 0.75" or less.

Foundation Requirements

Each mattress has specific foundation requirements. Foam mattresses need solid or closely-slatted surfaces (slats no more than 3" apart). Hybrids have similar requirements. Using the wrong foundation can void your warranty and accelerate wear.

Delivery and Setup

Confirm what's included: room of choice delivery vs. front-door delivery, old mattress removal, and any setup service. These details vary significantly across retailers.

10Common Mattress Buying Mistakes to Avoid

Buying Based on Price Alone

The "I'll just get the cheapest one that looks okay" approach almost always ends with replacement in 3–4 years. A mattress is a durability purchase — quality construction costs more but delivers dramatically better long-term value.

Ignoring Your Sleep Position

Buying a firm mattress because you have back pain (when you're a side sleeper) is one of the most common mistakes. Back discomfort has many causes, and sleeping on a mattress that's too firm for your position can make it worse, not better.

Rushing the Test

Three minutes on a showroom mattress isn't a real test. Spend at least 10 minutes per mattress in your actual sleep position. Bring your own pillow if you're testing in a store — your real pillow affects the feel significantly.

Not Accounting for Your Partner

Couples often make the mistake of buying the mattress that one partner prefers without adequately testing it for the other. If one partner is a side sleeper and the other sleeps on their back, a single firmness choice will involve compromise. Factor in both preferences from the beginning.

Overlooking the Foundation

A quality mattress on the wrong foundation can feel entirely different — and degrade faster. Don't assume your existing box spring works with a new foam or hybrid mattress.

Ignoring the Break-In Period

Most mattresses take 30–60 days to fully break in. Initial impressions in the first two weeks can be misleading. Don't trigger a return based on week-one feelings — give the mattress time to adapt to your body, and give your body time to adapt to the new surface.

11Bed in a Box vs. Traditional: A Quick Framework

Given the massive growth of online mattress brands, it's worth a quick comparison:

Bed-in-a-box mattresses — compressed, vacuum-sealed, and shipped to your door — have democratized access to quality mattresses at competitive prices. They're predominantly foam or hybrid construction and work best for buyers who know their preferences, value convenience, and appreciate generous trial periods.

Traditional mattresses (including those sold in stores like LA Mattress) offer the ability to test before buying, access to a wider range of constructions including traditional innerspring, and white-glove delivery services. They're often the right choice for buyers who want in-person guidance and the confidence of knowing exactly what they're getting before it arrives.

The good news: you don't have to choose one channel exclusively. Our full guide on bed-in-a-box vs traditional mattress pros and cons covers this decision in depth.

12Timing Your Purchase

If timing flexibility exists, the mattress industry has well-established sale cycles:

• Presidents' Day (February): Traditionally one of the biggest mattress sale events of the year
• Memorial Day (May): Major sale event across most retailers
• Independence Day / July 4th: Significant sale period
• Labor Day (September): End-of-summer sale, often tied to clearing inventory ahead of new models
• Black Friday / Cyber Monday: Online brands run significant promotions; in-store brands often match

That said, if you're sleeping poorly on a mattress that needs replacement, the cost of continued poor sleep — in energy, health, and quality of life — typically outweighs waiting 3–4 months for a sale. Most reputable retailers have regular promotions; waiting for a perfect sale window often means diminishing returns.

13When to Replace Your Current Mattress

Not sure if it's time to replace? Here are the key indicators:

• Visible body impressions (sagging or indentations where you sleep)
• Consistently waking up with stiffness, back discomfort, or soreness that clears during the day
• Better sleep quality when staying in hotels or at other locations
• Noisy coils (innerspring) that creak or squeak with movement
• Mattress is 8+ years old and comfort has noticeably declined
• Major life changes: new sleeping partner, significant weight change, new health conditions affecting sleep needs

The general guideline is 7–10 years for most mattresses, but construction quality and actual use patterns matter more than calendar age.

14Putting It All Together

Buying a mattress doesn't have to be overwhelming. The process becomes clear when you work through it systematically:

1. Identify your sleep position → determines firmness range
2. Factor in your body weight → adjusts firmness up or down
3. Choose your preferred mattress type → innerspring, foam, latex, or hybrid
4. Determine the right size → based on room dimensions and sleeping partners
5. Set a realistic budget → quality options exist from $800–$1,500
6. Test in person when possible → at least 10 minutes per option in your sleep position
7. Verify the details → trial period, warranty, foundation requirements, delivery
8. Give it time → 30–60 day break-in before forming a final verdict

The mattress that's right for you exists. It might be a foam option you test and buy online, a hybrid you try in person at LA Mattress, or a traditional innerspring that your body has always responded well to. The framework above will get you to it — without the confusion, the sales pressure, or the buyer's remorse that a rushed purchase often produces.

15Frequently Asked Questions