by Amerisleep AS3 vs Purple (2026): Which Mattress Actually Wins?
The AS3 wins on motion isolation, pressure relief, and long-term value. Purple wins on cooling alone.
For most sleepers, the Amerisleep AS3 is the stronger buy: superior motion isolation (10/10 lab score), deeper pressure relief, plant-based Bio-Pur foam, and a 20-year warranty at a lower effective cost. Choose the Purple Original only if you consistently wake up hot and want the unique grid feel that no foam can replicate. Both carry 100-night trials, so neither decision is permanent.
Amerisleep AS3
In our 2026 head-to-head test, the AS3 beats Purple on motion isolation, pressure relief, warranty coverage (20 years vs 10), and overall value. Plant-based Bio-Pur foam, HIVE 5-zone support, 100-night trial, free shipping.
Amerisleep AS3
9.1/10
- Top motion isolation in this matchup: 2.23 m/s² vibration transfer in lab testing
- HIVE 5-zone support reinforces the lumbar and allows shoulder contouring for side sleepers
- Plant-based Bio-Pur open-cell foam, CertiPUR-US certified, made in the USA
- 20-year warranty: full coverage years 1–10, 50% replacement discount years 11–20
- Runs slightly warmer than Purple’s grid (open-cell foam vs open-air polymer channels)
- Softer perimeter edge than a coil hybrid; sleepers over 230 lb may prefer the AS5 Hybrid
The AS3 beats Purple on every metric except cooling. For couples, side sleepers, or anyone who values long warranty coverage, this is the right call at a lower effective cost per covered night.
Construction: Bio-Pur foam vs GelFlex Grid
The Amerisleep AS3 stacks four layers into 12 inches. The Bio-Core base resists soft-spot formation over years of use. Above that, the HIVE transition layer adds firmness under the hips and more give at the shoulders through hexagonal cutouts of varying density. The Bio-Pur comfort layer uses an open-cell structure that breathes better than standard petroleum memory foam. The Refresh cover wicks moisture at the surface.
Purple’s Original is structurally different. A 4-inch poly foam support base and a 3.5-inch poly foam comfort layer sit under the 2-inch GelFlex Grid: a hyper-elastic polymer structure with roughly 1,400 open air channels. That grid is the entire proposition. It does not retain heat because it is mostly air, and it collapses independently under pressure points rather than contouring slowly like foam. The blended knit cover stretches with the grid. The feel is genuinely unlike anything foam produces, and you will know within the first night whether you respond to it.
How they compare: specs side by side
| Category | Amerisleep AS3 | Purple Original |
|---|---|---|
| Type | All-foam (Bio-Pur, plant-based) | GelFlex Grid + poly foam |
| Firmness | Medium 5/10 | Medium 5/10 |
| Height | 12″ | 9.5″ |
| Queen price | From $1,049 (sale) | From $1,499 |
| Motion isolation | Excellent (2.23 m/s² lab) | Excellent (2.23 m/s² lab) |
| Cooling | Very good (open-cell Bio-Pur) | Exceptional (10/10, 89.2°F max) |
| Edge support | Good (foam perimeter) | Poor (5.1/10, 7.75″ compression) |
| Trial | 100 nights | 100 nights |
| Warranty | 20 years | 10 years |
Firmness and sleeping position
Both mattresses rate medium (5/10) on a 10-point firmness scale. The AS3 contours progressively, with the HIVE layer allowing the shoulder to sink while providing firmer pushback under the hip and lumbar. The Purple grid collapses instantly under concentrated pressure points and springs back quickly. It does not have the slow contouring you expect from foam: it either supports or it does not.
Side sleepers under 180 lb typically prefer the AS3’s progressive contouring at the shoulder. Back sleepers often respond well to Purple’s consistent firmness across the body. Stomach sleepers can do well on either, but the grid’s instant response suits the position better than slow-response foam. Combination sleepers who move during the night usually prefer the AS3 for its motion isolation benefit.
Motion isolation: tied at the top
In lab testing, both the AS3 and Purple Original record 2.23 m/s² of vibration transfer. That is an outstanding score for either mattress. The practical difference is the source: the AS3 dampens motion through foam deformation, while Purple dampens it through the independent collapse of each grid cell. Both are genuinely excellent for couples. If motion isolation is your primary reason for choosing between the two, it is not a differentiator.
Cooling: Purple wins clearly
Purple’s GelFlex Grid scores a 10/10 in lab testing with a maximum surface temperature of 89.2°F. The AS3 runs warmer because even open-cell foam retains more heat than an open-air polymer channel system. If you wake up sweating at least two nights per week, Purple has a measurable and real cooling advantage. The AS3 sleeps cooler than traditional closed-cell memory foam, but it cannot match a grid that is mostly air.
Edge support: Amerisleep wins
The AS3’s foam perimeter holds up reasonably well at the edge of the mattress. Purple’s GelFlex Grid scores only 5.1/10 for edge support with 7.75 inches of compression when sitting on the perimeter. For couples who use the full mattress surface, or anyone who sits on the edge to put on shoes, the AS3 holds up noticeably better. Purple’s edge is a real limitation that rarely gets mentioned in comparisons.
Purple Original
8.5/10
- Exceptional cooling: 10/10 lab score, max surface temp 89.2°F
- Outstanding motion isolation, same 2.23 m/s² score as the AS3
- Unique instant-response grid feel, nothing like foam
- Fiberglass-free construction
- Poor edge support: 5.1/10, 7.75″ sitting compression
- Off-gassing on unboxing, allow 3–4 days to dissipate
- Only 10-year warranty vs AS3’s 20 years
- Higher price ($1,499 vs $1,049 queen) for shorter coverage period
If you consistently wake up hot and you have already tried foam and found it insufferable, Purple’s grid delivers cooling no foam-based mattress can match. But the shorter warranty and weak edge support make it the weaker value pick for most sleepers.
Price and long-term value
A queen Purple Original lists at $1,499. A queen Amerisleep AS3 lists near $1,399 but frequently sells for $1,049 during Amerisleep’s regular sale events. The AS3 is cheaper on most shopping days. More importantly, the warranty difference translates directly to cost per covered night: 20 years of coverage on the AS3 vs 10 years on Purple means the AS3 is a substantially better value if the mattress lasts its full warranty period.
Who should choose each one
Choose the Amerisleep AS3 if: you share a bed and motion transfer is a concern, you sleep on your side and want deep shoulder contouring, you need strong lumbar backing, or a long warranty and plant-based materials matter to you. The HIVE 5-zone layer and 20-year warranty are genuinely difficult to match at this price.
Choose the Purple Original if: you wake up hot at least two nights a week and foam mattresses have consistently made it worse. The grid’s cooling advantage over foam is real and lab-verified. Purple also fits back sleepers who want instant pressure response rather than slow contouring.
For more on the top all-foam options, see our best memory foam mattress guide. If cooling is your main concern, our best cooling mattresses roundup covers grid, gel, and hybrid options side by side. For the best coil-hybrid alternative to the AS3, see the Amerisleep vs Saatva comparison.
The Amerisleep AS3 wins on price, warranty, pressure relief, and edge support. The Purple Original wins on cooling alone. If you do not consistently wake up hot, the AS3 is the better mattress for most sleepers. Both offer 100-night trials, so the decision is reversible.
Frequently asked questions
Is Amerisleep or Purple better for side sleepers?
The Amerisleep AS3 is better for most side sleepers. Its HIVE 5-zone Bio-Pur layer allows the shoulder to sink while maintaining firmness under the hip and lumbar. Purple’s grid responds instantly rather than contouring progressively, which can feel supportive but less cradling for side sleepers who need deep shoulder relief.
Is Purple cooler than Amerisleep?
Yes, measurably. Purple’s GelFlex Grid scores 10/10 in lab cooling tests with a max surface temp of 89.2°F. The AS3’s open-cell Bio-Pur foam sleeps cooler than traditional memory foam but cannot match 1,400 open polymer channels. If you consistently wake up hot, Purple has a genuine and lab-verified cooling advantage.
Which has better motion isolation?
Both score identically at 2.23 m/s² in lab testing: an excellent result for couples. The mechanisms differ (foam deformation vs independent grid-cell collapse) but the outcome is the same. Motion isolation is not a differentiator between these two.
How do the warranties compare?
Amerisleep offers a 20-year warranty: full repair or replacement in years 1–10, 50% replacement discount in years 11–20, covering sagging over 1.5 inches and manufacturing defects. Purple offers a 10-year limited warranty. On a cost-per-covered-night basis, the AS3 is the better long-term investment.
Is Purple off-gassing a concern?
Purple lists off-gassing as lasting 3–4 days after unboxing. The AS3’s Bio-Pur foam typically off-gasses for 1–2 days and at a lower intensity. Neither is a health concern at normal ventilation levels, but it is worth noting if you are sensitive to new-foam smells.
Amerisleep AS3
9.1/10
Best pressure relief, excellent motion isolation, strong edge support, plant-based Bio-Pur foam, 20-year warranty, and a 100-night trial. The most complete pick in this comparison for most sleepers who do not consistently wake up hot.