Cooler, Firmer Support for Hot Sleepers, Sore Hips & Tired Backs
Due to high demand, limited quantities available.
Sleep on it for 100 nights. If you do not feel the difference, send it back for a full refund. We pay the return shipping. No restocking fee, no questions. Less than 2% of orders come back, but we built the trial that way because we would rather refund a few than have anyone stuck with the wrong topper.
A 2003 randomized trial in The Lancet (Kovacs et al., 313 patients) found a medium-firm sleep surface beat a firm one for chronic low-back pain. The high-density pillowtop core holds exactly that zone. Separately, your skin has to cool by about one degree to drop into deep sleep. Foam holds heat against you; the bamboo viscose cover pulls moisture off the skin so heat can leave through the surface instead of pooling.
Orders are processed within 1 to 3 business days and ship from our U.S. warehouse with tracking. Free 3-day U.S. shipping. You get a tracking link by email as soon as it leaves the warehouse. Every order is covered by the 100-day money-back guarantee and a 3-year warranty.
The cover is OEKO-TEX® Standard 100 certified. No latex, no formaldehyde, no synthetic chemical cooling treatments. The viscose-from-bamboo surface is gentler against sensitive skin than synthetic fibers, and the whole topper is machine washable on cold.
Cover: 40% bamboo viscose (rayon from bamboo), 60% polyester. Fill: high-density polyester, medium-firm pillowtop construction. Base: 100% polyester deep-pocket skirt, fits mattresses 8 to 20 inches deep. Sizes: Twin, Twin XL, Full, Queen, King, California King. Care: cold machine wash separately, tumble dry low.
How quickly will I notice it? Most customers feel a change on the first night. The full benefit usually lands by night 7.
Will it work if my mattress is bad? That is when it works hardest. The deep-pocket base wraps any mattress, old, firm or sagging, and changes the surface your body actually touches.
It arrived flat. It ships vacuum-compressed. A cold wash and low-heat tumble dry, or 24 hours lying flat, brings it to full loft.
Does it fit an adjustable base? Yes. It flexes with the base and the skirt keeps it in place.
Every layer in the Nagi topper is there for a reason, and backed by 400 years of Japanese sleep tradition, not marketing fluff. We don't hide behind "proprietary blends" or vague labels. You get a clear, transparent build, each layer solving a problem the others don't.
Bamboo Viscose CoverMoisture WickingViscose from bamboo pulls moisture into the fiber itself instead of letting it sit against your skin. Heat leaves through the surface, which is why you wake up dry on the nights a cooling gel would have saturated.
High-Density PillowtopMedium-Firm SupportAbout three inches of lofted fill that holds the medium-firm zone The Lancet validated for chronic back and hip pain. It gives at the shoulder, then pushes back, so your weight spreads instead of concentrating on one point.
Deep-Pocket SkirtFits 8 to 20 InchesA 360-degree elastic skirt wraps any mattress 8 to 20 inches deep, including pillow-tops and adjustable bases. No straps, no slipping, and it goes on in about 30 seconds.
Shikibuton Method400-Year TraditionWalk into a ryokan in Kyoto and you won't find a $4,000 mattress. You'll find a thin, layered shikibuton on top of whatever is underneath. The part that touches your body matters more than the slab beneath it. That principle is the whole design.
OEKO-TEX® CertifiedSafe For Sensitive SkinStandard 100 certified. No latex, no formaldehyde, no chemical cooling treatments that wash out after a month. Gentler against sensitive skin than synthetic fibers.
Machine WashableEasy CareCold wash, tumble dry low, and it comes back to full loft every time. No dry cleaning, no spot-treat-only labels. It is built to survive real laundry for years, not a season.
Most "cooling" toppers on the market sound the same, but there are critical differences in what is inside them and how they behave at 3am. Here is why ours stands out:
A breathable bamboo cover, a high-density pillowtop core and a conforming deep-pocket base. Each one solves a problem the others don't, so one topper handles heat, pressure and a sagging mattress at the same time.
Most "bamboo" toppers are synthetic blends with a thin bamboo facing. Ours is built around a viscose-from-bamboo cover that pulls moisture off the skin before it can build into heat.
Memory foam stays compressed where you slept. Our pillowtop returns to full loft every morning and holds the medium-firm zone clinical research points to for back and hip pain.
Your sleep is our priority. Every order is covered by the 100-day money-back guarantee and a 3-year warranty, and our team replies 7 days a week.
18,742+ Happy Customers
Excellent 4.8
FIRST PAIN-FREE MORNING IN 8 MONTHS. I'd been waking at 4:30 every morning, hip throbbing, ready to spend the $2,400 on the Tempur-Pedic. The Nagi arrived Tuesday. Night 14 I slept past 6 and just laid there trying to figure out what was different. The Tempur-Pedic is still in the cart. I'm not buying it.
Sarah M.
Eleven year old mattress. We'd been having the “do we spend $1,800 we don't have” conversation for SIX MONTHS. Bought the Nagi half hoping. Husband said it on night three: “this is different.” We saved the $1,800. Same bed. Different layer.
Rachel T.
My gynecologist literally said the words “before we talk about hormones, change what you sleep on.” I went home annoyed because I'd already burned $600 on cooling toppers. The Nagi lasted past 1am. Then 2am. Then 3am. I have not asked for hormones. Three months in.
Jennifer S.
Don't let any menopause talk fool you, I'm 45 and not menopausal. I bought this because hotel beds always feel different and I needed to know why. Now my bed at home feels exactly like the one at the Four Seasons. Worth every dollar.
Megan L.
I've tried every cooling topper on Amazon. Every single one. The Nagi is in a different category entirely. My shoulder used to wake me 3 or 4 times a night. Three weeks in I realized I'd slept the whole night without rolling over once.
Julia D.
38, not menopausal, just a hot sleeper my whole life. The kind of sleeper who flips the pillow constantly looking for the cool side. I haven't flipped the pillow in two months. The whole side stays cool now.
Brianna T.Setting up your Nagi topper is simple, takes about 30 seconds, and needs no tools, straps or flipping.
of Americans woke up with back pain in the last three months.
of Nagi sleepers reported deeper sleep within the first week
said they ran cooler through the night, including hot sleepers and women in perimenopause
would recommend Nagi to a friend before buying a new mattress
Don't feel the difference within 100 nights? We'll refund you. No questions asked.
Because we're not selling you a mattress. We're selling you the layer the Japanese figured out 400 years ago, the part that actually touches your body. The slab underneath isn't the problem. The layer is. NagiCore™ replaces the layer, not the bed. That's why it costs a fraction of a new mattress and why it works on whatever mattress you already own.
Most "bamboo cooling" toppers are synthetic blends with a thin bamboo facing. Nagi is built around a viscose-from-bamboo cover sitting over a high-density pillowtop core, with the architecture published openly. We tell you what's inside because the inside is what sets us apart.
That's actually when it works hardest. The conforming base wraps any mattress 8 to 20 inches deep, old, firm, sagging, even uneven, and changes the surface your body contacts. The worse the mattress underneath, the more obvious the difference is on night one.
Most customers feel a change on the first night. The full benefit, pressure-point relief, cooler sleep, the "hotel bed" feel, typically lands by night 7. We give you 100 nights to feel it. If you don't, every cent comes back.
Send it back. We pay return shipping. Full refund. No restocking fee. No questions. Less than 2% of orders are returned, but we built the trial that way because we'd rather refund a few than have anyone stuck with the wrong topper.
The conforming deep-pocket base fits any mattress 8 to 20 inches deep, including pillow-tops and adjustable bases. Setup takes under 30 seconds. No straps, no slipping.
The viscose-from-bamboo cover is gentler against sensitive skin than synthetic fibers. No latex, no formaldehyde, no synthetic chemical cooling treatments. Machine washable on cold. OEKO-TEX® Standard 100 certified.
That's expected. It ships vacuum-compressed to protect the fibers. A cold wash and low-heat tumble dry (about 4 hours) brings it to full loft, or lay it flat and let it expand on its own in about 24 hours. Give it three nights before you judge it.
Orders are processed within 1 to 3 business days and ship from our U.S. warehouse. Most orders arrive within 3 to 7 days, many sooner. You'll get a tracking link by email once it's on the way.
