by Amerisleep AS3 vs Nectar (2026): Which Wins?
The Amerisleep AS3 is the better mattress for most people comparing these two beds. It edges out the Nectar Classic on pressure relief, uses a plant-based foam construction that Amerisleep lists as fiberglass-free, and backs the purchase with a 20-year warranty. Where Nectar pulls ahead is price and trial length: the Classic runs roughly $600 less at queen size and comes with a 365-night trial, the longest in the all-foam category. If you sleep on your side or back and want a low-tox, high-quality foam bed, the AS3 is the cleaner call. If you are on a tight budget and want a long runway to decide, the Nectar Classic is a reasonable alternative at a noticeably lower price.
| Spec | Amerisleep AS3 | Nectar Classic |
|---|---|---|
| Price (queen) | From $1,149 | ~$649 (on sale) |
| Construction | All-foam (plant-based Bio-Pur) | All-foam (gel memory foam) |
| Firmness | Medium (5/10) | Medium-firm (6.5/10) |
| Cooling | 9/10 NapLab (open-cell Bio-Pur) | Gel foam + cool cover |
| Motion isolation | 10/10 (NapLab) | Good (all-foam) |
| Edge support | 8.0/10 (NapLab) | Softer foam perimeter |
| Trial period | 365 nights | 365 nights |
| Warranty | 20 years | Forever (lifetime) |
| Height | 12" | 12" |
| CertiPUR-US | Yes | Yes |
How we rate
These are MattressNut's editorial ratings, based on construction, brand specifications and independent lab data where available (NapLab, for the AS3). They are not results from our own lab tests. Last updated June 2026.
Amerisleep AS3
8.9/10
- Top-tier pressure relief and motion isolation (NapLab 10/10 on both)
- Plant-based Bio-Pur foam, CertiPUR-US certified, fiberglass-free
- HIVE 5-zone layer delivers cushioning at shoulders and hips, support under the back
- 20-year warranty backs the investment over the long haul
- One firmness only, not ideal for strict stomach sleepers over 230 lbs
- Softer perimeter edges than a coil bed (NapLab 8.0/10 edge support)
- Priced roughly $600 higher than the Nectar at queen size
The AS3 is the better bed for most people in this comparison: superior pressure relief, cleaner foam construction, and a 20-year warranty at a fair mid-range price.
Nectar Classic
7.8/10
- Industry-low price, often around $649 queen on sale
- 365-night trial is three times the category standard with free returns
- Solid motion isolation for couples on a budget
- Forever Warranty: free repair or replacement for impressions of 1.5 inches or more
- Pressure relief trails the AS3, especially at shoulders for side sleepers
- Weak edge support, noticeable compression on the perimeter
- Budget-tier foam density raises durability questions vs premium builds
The Nectar Classic is the budget-friendly option with the longest trial in the all-foam category, but it gives up real ground on pressure relief and cooling compared to the AS3.
Amerisleep AS3 vs Nectar Classic: Full Comparison
Construction and Materials
The AS3 is a 12-inch all-foam mattress built around Amerisleep's Bio-Pur layer, a plant-based open-cell foam that swaps a portion of petroleum feedstock for plant-based oils. Amerisleep says that substitution increases airflow inside the foam cells; NapLab scores the AS3 9/10 for cooling, a strong result for a pure foam bed. Beneath the Bio-Pur sits the HIVE layer, a 2-inch transition foam cut with thousands of hexagonal perforations that change in density by zone. The cutouts are wider and softer under the shoulders and hips, tighter and more supportive under the back. The zoning is designed to cushion the shoulders and hips while supporting the back.
The Nectar Classic uses a more conventional construction. A cool-to-the-touch quilted poly cover sits over a gel-infused memory foam comfort layer, then a medium-density adaptive poly foam transition layer, then a high-density poly base. The gel in the top comfort layer helps somewhat with heat, but the foam cells in traditional gel memory foam do not breathe as efficiently as the open-cell Bio-Pur. NapLab measured an 85.4°F peak surface temperature on the AS3. Both beds are CertiPUR-US certified. Amerisleep lists the AS3 as fiberglass-free. If fire-barrier materials matter to you, check the law tag on any mattress before removing its cover.
Feel and Firmness
At a medium 5/10, the AS3 has a contouring, pressure-relieving feel without the heavy slow-sink of older dense memory foams. The Bio-Pur foam is designed to contour and respond more quickly than traditional memory foam. On your side, you notice the shoulder zone give almost immediately, then the HIVE base supporting your hip so your spine stays roughly neutral. Back sleepers find the AS3 supportive without feeling stiff.
The Nectar Classic sits at a medium-firm 6 to 6.5/10, which puts it about a half-step firmer than the AS3. For back sleepers who prefer a bit more resistance under the lumbar, that firmness can feel pleasant. For side sleepers under about 160 lbs, the Nectar can feel a little unyielding at the shoulder. The classic gel-memory feel is slower-response than the AS3's Bio-Pur, which some people love for the "cradled" sensation and others find too immobilizing. Neither bed has bounce worth mentioning; if you want responsiveness for active sleeping or sex, consider a hybrid instead.
Pressure Relief
This is where the AS3 wins most decisively. NapLab scores the AS3 10/10 for pressure relief. The Nectar, being slightly firmer, tends to concentrate more pressure at the hip and shoulder for side sleepers. For people who wake up with hip or shoulder discomfort on other mattresses, this gap matters. The AS3 is the better choice for chronic pressure pain.
Motion Isolation
Both beds do well here, as you would expect from all-foam designs. NapLab scores the AS3 10/10, with motion transfer 76% below its average. In practical terms, you will not feel your partner's movements on either bed. Couples light-sleeping in the same bed will appreciate both options, though if one partner is extremely restless, the AS3 absorbs those movements a touch better.
Cooling
NapLab scores the AS3 9/10 on cooling (85.4°F peak). The Nectar's gel-infused top layer helps at the surface, and the cool-to-the-touch cover creates an initial freshness, but the underlying foam layers are denser and less breathable than the AS3's open-cell Bio-Pur. For most sleepers who run warm, the AS3 is the safer choice. If you sleep hot enough to need a mattress with phase-change materials or active coil ventilation, neither of these all-foam beds is your best bet and you should look at a hybrid. Between the two here, the AS3 wins.
Edge Support
Neither all-foam mattress excels at edge support. NapLab scores the AS3 8.0/10, with 5.5 inches of sitting compression, and both perimeters compress noticeably when you sit on them. If edge support is a priority for you, a coil-based hybrid is the right category entirely.
Trial Period and Warranty
Nectar wins this one outright. You can sleep on the Nectar through autumn and into the following summer before you have to commit to keeping it. Amerisleep's 365-night trial is adequate; most people know within the first 30 days whether a mattress works for them. But if you are someone who takes longer to adjust to new sleep surfaces, the Nectar's trial removes all pressure.
On warranty: Amerisleep offers 20 years, which is double the industry standard for a foam bed. Nectar offers a lifetime warranty. Both cover manufacturing defects for the practical life of the mattress. The Nectar's lifetime warranty wins technically, but in practice, most people replace a mattress before either warranty would apply.
Price and Value
This is where the Nectar makes its strongest case. At roughly $649 for a queen during frequent Nectar sales, it costs about,249. Per dollar spent, the Nectar offers reasonable performance. The tradeoff is real, though: in our rating you get less pressure relief and a firmer feel for side sleepers. The AS3 earns its higher price with a meaningfully better sleep surface and a cleaner build. If budget is your primary constraint, the Nectar is worth considering. If you can stretch to the AS3, the upgrade is worth it.
Who Should Buy the Amerisleep AS3
The AS3 is the right choice for side and back sleepers under roughly 230 lbs who want superior pressure relief, reliable cooling, and a plant-based foam build. Couples who share a bed benefit from its 10/10 NapLab motion isolation, and Amerisleep lists it as fiberglass-free. The 20-year warranty gives real assurance that the mattress will hold up.
Who Should Buy the Nectar Classic
The Nectar makes sense for budget-conscious back sleepers who want a medium-firm all-foam feel without spending over $1,000. The 365-night trial is a genuine advantage if you are uncertain about firmness and want time to decide. Couples on a budget will appreciate the solid motion isolation. Check the law tag if fire-barrier materials matter to you, and factor in the weaker pressure relief before committing if you sleep on your side.
Our Verdict
The Amerisleep AS3 wins this comparison for most sleepers. Better pressure relief, strong independent cooling and motion scores, and a 20-year warranty justify the higher price. The Nectar Classic earns its place as the budget option with a longer trial and a competitive lifetime warranty, but it is a step down in quality where it counts most. If you sleep on your side or back and want the better bed, go with the AS3. If your budget tops out around $650 and you want maximum trial time, the Nectar is a workable second choice.