Before browsing, answer three questions: What position do you sleep in? (side → softer; back → medium-firm; stomach → firm.) Do you sleep hot? (prioritize hybrids/coils.) What's your budget? ($800–$1,200 buys excellent; under $500 needs careful picking.) Everything else flows from these.
| Size | Dimensions | Best for |
|---|
| Twin / Twin XL | 38"×75" / 38"×80" | Kids, single sleepers, small rooms (XL for tall teens) |
| Full | 54"×75" | Single adults who want space; tight guest rooms |
| Queen | 60"×80" | Couples, most master bedrooms — the most popular size |
| King / Cal King | 76"×80" / 72"×84" | Couples who want maximum space (Cal King for tall sleepers) |
Measure your room and doorways before ordering — a king won't bend around a tight staircase.
Mattresses rate firmness 1–10. Ignore the numbers' precision; think in bands: soft (3–5) for lightweight side sleepers, medium (5–7) for most people, firm (7–9) for stomach sleepers and heavier back sleepers. When in doubt, choose medium-firm — it suits the widest range and most brands' exchange policies are generous.
- Memory foam: best pressure relief, most heat retention.
- Latex: responsive, breathable, durable — and expensive.
- Polyfoam: the workhorse base layer; quality varies by density (look for 1.8+ lb/ft³).
- Coils: support, bounce, airflow. Pocketed coils > connected coils.
- Covers: cotton, phase-change, and heat-wicking fabrics help surface coolness.
A trial (100–365 nights) is your real protection — it's how long you have to return it. A warranty (10 years to lifetime) covers manufacturing defects, not comfort, and usually requires sagging beyond 0.75–1.5 inches. Also check: who pays return shipping, and whether "lifetime" is prorated after year 10.
Mattress prices are extremely seasonal. The deepest discounts hit on Presidents' Day, Memorial Day, July 4th, Labor Day, and Black Friday/Cyber Monday — expect 20–35% off. If you can wait six weeks for the next holiday, do.
Bed-in-a-box ships compressed to your door; unbox within a few weeks and allow 24–72 hours to fully expand. Premium brands like Saatva offer white-glove delivery — they'll set it up and remove your old mattress, worth it for heavy hybrids.
How thick should a mattress be?
10–12 inches suits most adults. Heavier sleepers and those wanting a luxury feel should look at 13–14 inches.
Do I need a box spring?
Not with modern mattresses — a platform bed, slatted base (slats <4" apart), or adjustable base works. Old box springs with actual springs can damage foam mattresses.
How do I know when to replace my mattress?
Morning pain that fades after waking, visible sagging, or sleeping better in hotels are the classic signs. Most mattresses last 7–10 years.
Is a mattress protector necessary?
Yes — it guards against stains (which void warranties) and allergens. Choose a thin, breathable one so you don't trap heat.