by Amerisleep AS3 vs Mattress Firm (2026): Side-by-Side Comparison
Amerisleep sells one medium-feel all-foam mattress built to balance support and softness. Mattress Firm is a retailer carrying many brands, so what you get depends on the model you pick. Here is how the two compare for back pain, pressure relief, and trial terms.
The Amerisleep AS3 is the better pick for back pain if you want a single, clearly specified mattress with a fixed trial and warranty. It is a medium-feel all-foam bed built to balance support and softness for every sleep position, backed by a 100-night trial, a 20-year warranty, and free shipping and returns. Mattress Firm is a retailer carrying many brands, so the trial, warranty, and return process depend on the specific mattress you buy and the store you buy it from. If you want to try a mattress in person before committing, Mattress Firm's stores are useful. If you want a straightforward online purchase with clear terms, the AS3 is the simpler choice.
Amerisleep AS3
A medium-feel all-foam bed that Amerisleep builds to balance support and softness for every sleep position.
Saatva Classic
- 365-night home trial is longer than the AS3's 100 nights
- Lifetime warranty is longer than the AS3's 20-year warranty
- Free white-glove delivery and old-mattress removal
- Three comfort levels (Plush Soft, Luxury Firm, Firm) let you dial in feel
- Innerspring construction is less contouring than all-foam for strict side sleepers
- Choosing between three comfort levels adds a decision most buyers do not want
The Saatva Classic is the runner-up because its trial and warranty terms are stronger on paper: 365 nights versus 100, and a lifetime warranty versus 20 years. It also includes white-glove delivery and old-mattress removal. The trade-off is that it is an innerspring with three comfort levels to choose from.
Amerisleep AS3 vs Mattress Firm: key specs
| Spec | Amerisleep AS3 | Mattress Firm (retailer) |
|---|---|---|
| What it is | Single all-foam mattress | Retailer carrying many brands |
| Construction | All-foam (Bio-Pur, plant-based) | Varies by model |
| Firmness | Medium feel | Varies by model |
| Trial | 100 nights | Varies by model |
| Warranty | 20 years | Varies by model |
| Shipping | Free shipping and returns | Varies by model |
| Where to buy | Online direct from Amerisleep | In-store and online |
| Price | – | – |
Construction and materials
The Amerisleep AS3 is an all-foam mattress built around Bio-Pur, a plant-based foam Amerisleep uses in place of conventional memory foam. The medium feel is designed to balance support and softness across sleep positions, which matters for back pain because you want the hips supported without the shoulders being pushed out of alignment.
Mattress Firm does not build a single mattress. It carries brands like Sealy, Tempur-Pedic, and others, each with its own construction. For example, one model on the retailer's site is a 13-inch medium mattress with encased coils, gel foam comfort, and a reinforced edge. Another is a 14-inch medium hybrid with gel memory foam and targeted coil support. A third is a 13-inch all-foam memory foam mattress in a box. The construction you get depends entirely on which model you choose.
That is the core difference in this comparison: Amerisleep gives you one construction with known materials, while Mattress Firm gives you a range of constructions to sort through.
Feel and firmness
The AS3 has a medium feel. Amerisleep positions it as a bed that balances support and softness for every sleep position, which puts it in the middle of the firmness range.
At Mattress Firm, firmness depends on the model. The retailer carries medium-feel options, but also firmer and plusher ones.
Pressure relief
Pressure relief is where the AS3's all-foam construction does its work.
At Mattress Firm, pressure relief varies by model. Some carry gel memory foam comfort layers designed to disperse weight. Others use coil systems with foam comfort layers on top.
Cooling
The AS3 uses Bio-Pur, a plant-based foam.
Mattress Firm carries models with various cooling features. One example on the retailer's site includes a cover designed to keep you cool and dry. Another uses a gel memory foam layer and a cool-to-the-touch cover.
Motion isolation
All-foam mattresses like the AS3 have no coils, so a partner's movement transfers less across the surface.
At Mattress Firm, motion isolation depends on the model. Individually encased coils are designed to limit motion transfer.
Trial period and warranty
The Amerisleep AS3 comes with a 100-night trial and a 20-year warranty. Shipping and returns are free. These terms are fixed.
At Mattress Firm, trial and warranty terms vary by model. Some models on the retailer's site carry a 120 Night Sleep Trial, which is longer than the AS3's 100 nights. The retailer also advertises a Low Price Guarantee. Warranty terms are set by the manufacturer of each mattress, not by the retailer, so you will need to check the specific model's warranty before buying.
Price and value
We do not publish prices on this page, because mattress prices change frequently and vary by size and promotion. The AS3's terms are fixed: a 100-night trial, a 20-year warranty, and free shipping and returns, all attached to one clearly specified mattress.
At Mattress Firm, value depends on the model you choose and the promotion running at the time. The retailer advertises a Low Price Guarantee. If you are comparing prices, check the AS3's current price on Amerisleep's site and the specific Mattress Firm model's price on the retailer's site, then compare the trial and warranty terms alongside the price.
Who should buy each mattress
Buy the Amerisleep AS3 if: you want a single, clearly specified medium-feel all-foam mattress with a fixed 100-night trial, a 20-year warranty, and free shipping and returns. If you prefer to shop online and know exactly what you are getting, the AS3 is the simpler path.
Buy from Mattress Firm if: you want to try mattresses in person before buying, you want a Sleep Expert to walk you through options, or you have a specific brand model in mind (such as a Sealy or Tempur-Pedic) and want the retailer's trial and delivery terms. Before buying, confirm the trial length, the return process, and the warranty terms for the specific model you choose.
The Amerisleep AS3 is the clearer pick for back pain if you want one mattress with fixed terms: medium feel, all-foam construction, 100-night trial, 20-year warranty, free shipping and returns. Mattress Firm is a retailer, not a mattress, so the trial, warranty, and construction vary by model. Use the retailer if you want to try beds in person or have a specific brand model in mind, and confirm the terms for that model before you buy.
Frequently asked questions
Is Amerisleep AS3 or Mattress Firm better for back pain?
The AS3 is a single medium-feel all-foam mattress built to balance support and softness for every sleep position. Mattress Firm is a retailer carrying many models, so whether a specific mattress is good for back pain depends on that model's construction and feel. If you want to try several options in person, Mattress Firm's stores are useful.
Can I try a Mattress Firm mattress before buying?
Yes, if you buy in store. Mattress Firm operates physical locations where you can lie on display models. Online purchases follow the specific model's trial terms. Ask the store or check the product page for the trial length and return process before buying.
Which has a longer trial, Amerisleep or Mattress Firm?
The AS3 has a 100-night trial. Some models at Mattress Firm carry a 120 Night Sleep Trial, which is longer. Trial terms vary by model at the retailer.
Does Amerisleep AS3 come with free returns?
Yes. Amerisleep offers free shipping and returns on the AS3. At Mattress Firm, return terms vary by model and purchase channel.
How do I choose between Amerisleep and a specific Mattress Firm model?
Compare three things: the construction (all-foam vs hybrid vs innerspring), the trial and warranty terms, and the return process. The AS3 gives you a fixed set of terms. At Mattress Firm, terms vary by model.