Everlasting Comfort Under-Knee Pillow
Best for: Back sleepers with lower-back pain
The back-sleeper's pick — an under-knee bolster that lets the knees bend to flatten the lumbar arch, and the highest-rated pillow here.
Everlasting Comfort's under-knee pillow solves a different problem than the side-sleeper contours: placed under the knees when you lie on your back, it lets the knees bend slightly, which flattens the arch in your lower back and unloads the lumbar spine — a genuine relief for back pain and post-surgery recovery. The half-cylinder memory foam is firm enough to hold the lift all night, with a removable, breathable cover the brand says can be taken off for cleaning. At 4.5 stars it's the best-rated pillow in this lineup. The brand also lists side sleepers and says it can be used between the legs or behind the lower back, and taller sleepers may want more height than its single loft provides.
Price & where to buy
Prices checked 2026-11-01Prices shown were last checked on 2026-11-01 and can change at any time — the price on the retailer's site at checkout is the one that applies. Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of this product. As an Amazon Associate and affiliate we may earn a commission on purchases made through these links, at no extra cost to you.
How our prices work
We show the price at our recommended retailer as at our last check of that offer (2026-11-01) and, when Amazon reports one, its list price for comparison. Amazon prices come from Amazon's own product data service and are refreshed twice a day; each one shows the date and time Amazon gave it, and one older than 24 hours is replaced by “Check price”. Other retailers' prices are checked by hand and show the date of that check. Retail prices move constantly, so the price on the retailer's own page at checkout is the one that applies. More on Amazon prices
Should you buy it?
What we like
- Under-knee lift flattens the lumbar arch
- 4.5 stars — highest rated here
- Firm memory foam holds the lift all night
- Removable breathable cover
What to know before buying
- Multi-use half-moon shape rather than a dedicated contour
- Single loft may be low for tall builds
- Memory foam retains some heat
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At a glance
How it scores
How our 8.3/10 breaks down — rated on the dimensions that matter most for knee pillows, from published specifications and third-party test data, not the marketing.
Featured in our guides
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Compare with alternatives
Quick verdicts for the knee pillows most often considered alongside the Everlasting Comfort Under-Knee Pillow.
Everlasting Comfort Under-Knee Pillow vs ComfiLife Knee Bolster for Back Sleeping
The half-moon bolster from the category's bestselling brand — a memory-foam half-cylinder that props the knees to relieve the lower back.
→ Back and side sleepers wanting a trusted-brand bolster
ComfiLife Knee Bolster for Back Sleeping review →Everlasting Comfort Under-Knee Pillow vs 5 STARS UNITED Half-Moon Knee Pillow
The low half-moon bolster — a subtler under-knee lift for back sleepers who find full bolsters too tall, at a friendly price.
→ Back sleepers who want gentle, low lift
5 STARS UNITED Half-Moon Knee Pillow review →Not sure which one is right for you?
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Frequently asked questions
Everlasting Comfort vs 5 STARS UNITED?
Both are under-knee bolsters for back sleepers. Everlasting Comfort is a taller half-cylinder rated 4.5 stars; the 5 STARS UNITED is a lower half-moon for gentler lift. More lift + top rating: Everlasting Comfort. Lower, subtler support: 5 STARS UNITED.
Everlasting Comfort vs ComfiLife bolster?
Very similar under-knee bolsters, and both brands say theirs also work between the legs. Everlasting Comfort edges ahead on rating (4.5); the ComfiLife bolster is a close alternative from the category's bestselling brand. Both do the same lumbar-relief job.
Can side sleepers use it?
Possibly. The brand lists side sleepers among who it is for and says it can be placed between or under the legs. It is mainly built as an under-knee bolster for back sleeping, so side sleepers who want a dedicated contour may prefer ComfiLife or Contour Legacy.
Does it help lower-back pain?
For many back sleepers, yes — bending the knees over a bolster reduces the lumbar arch and the muscular tension that comes with lying flat. It eases posture-related ache; see a doctor for an actual back injury.