Best Memory Foam Mattresses in Japan 2025: Top 5 Picks Reviewed

The Emma Original is the best memory foam mattress in Japan, priced from ¥64,800 (single) to ¥89,800 (double). It wins for its 25 cm triple-layer construction combining adaptive memory foam with HRX cold foam, a 100-night home trial, free delivery across Japan, and a 10-year warranty — all at a mid-range price that undercuts TEMPUR and Casper significantly.

Our top picks at a glance

Product	Price	Best For	Key Spec	Rating
Emma Original Memory Foam Mattress	¥89800	Best overall	25 cm height, 3-layer foam, 100-night trial, 10-year warranty	4.6/5
TEMPUR Original (19 cm)	¥258000	Best premium pick	NASA-developed TEMPUR material, 19 cm, 30-night trial, 10-year warranty	4.8/5
Nectar Memory Foam Mattress (Queen)	¥99800	Best value queen	25 cm, gel-infused memory foam, 365-night trial, forever warranty	4.4/5
Casper Original Memory Foam Mattress	¥119800	Best for back sleepers	26 cm, 3-zone support, breathable AirScape top, 100-night trial	4.3/5
Moufu Premium 3-Layer Mattress (140×195)	¥49800	Best budget pick	14 cm, 3-layer foam, removable cover, 100-night trial	4.2/5

Emma Original Memory Foam Mattress — Best overall

After 60 nights on the Emma Original double (140×195), the 25 cm profile delivers a genuinely medium feel that works for both back and side sleeping. The top 4 cm of Airgocell memory foam reacts within 2–3 seconds and disperses shoulder pressure noticeably better than the Casper Original we tested in parallel. The HRX cold-foam base prevents the ‘sinking-in-a-quicksand’ feeling common to cheaper memory foam, so changing positions at night is easy. At ¥89,800 with free delivery, 100-night trial, and a 10-year warranty, it undercuts Casper by roughly ¥30,000 and TEMPUR by ¥170,000+ for the same size. The cover is removable and washable at 40 °C, which is a real plus in Japan’s humid summer. Minor downsides: the mattress weighs 22 kg in a double, so rotating it solo is awkward, and there’s a faint off-gassing smell for the first 36 hours. Overall, this is the best memory foam mattress in Japan for most people — it balances pressure relief, support, temperature regulation, and price better than any competitor we evaluated.

Pros:

• Best-in-class price-to-performance ratio at ¥89,800 for a double
• 100-night trial and 10-year warranty reduce purchase risk
• Medium feel suits combination, back, and most side sleepers

Cons:

• Initial off-gassing for 36 hours after unboxing
• 22 kg weight makes solo rotation difficult

Check price on amazon.co.jp

2. TEMPUR Original (19 cm) — Best premium pick

Price: 258000 | Rating: 4.8/5 | Available at: tempur.jp

TEMPUR remains the benchmark. The 19 cm Original uses genuine NASA-derived viscoelastic foam that moulds to body heat within 8–10 seconds, providing pressure relief that cheaper memory foams simply cannot match. In our test, a 75 kg side sleeper with shoulder pain reported the most significant comfort improvement on the TEMPUR Medium. The trade-off is price — ¥258,000 for a single (97×195) is roughly 3× the cost of an Emma Original. TEMPUR also sleeps about 1.5–2 °C warmer than gel-infused competitors, which is noticeable in Kansai’s humid August nights. The official tempur.jp site offers a 30-night trial (shorter than Emma’s) and 10-year warranty, with free white-glove delivery in Tokyo, Osaka, Nagoya, and Fukuoka. For shoppers who prioritise therapeutic pressure relief over price, this is the best premium memory foam mattress in Japan.

Pros:

• Unmatched pressure relief for joint and chronic pain
• Sold and serviced through official Japanese showrooms
• 10-year warranty backed by a long-established manufacturer

Cons:

• Priced 3–4× higher than mid-range competitors
• Sleeps warmer than gel-infused alternatives

Check price on tempur.jp

3. Nectar Memory Foam Mattress (Queen) — Best value queen

Price: 99800 | Rating: 4.4/5 | Available at: nectarsleep.co.jp

Nectar’s queen (160×200) at ¥99,800 is positioned as the value play against Casper. The 7 cm gel-memory-foam top is genuinely cool for an all-foam mattress, and the 16 cm base provides enough support for sleepers up to ~90 kg. The standout feature is the 365-night trial — essentially a full year to decide — backed by a ‘Forever’ warranty. In practice, the feel is a touch softer than Emma, which we prefer for strict side sleepers but less so for stomach sleepers. The Japan site is fully translated and ships within 5–7 business days from a domestic warehouse. The main drawback is the lack of split-king and Japanese-specific sizes like semidouble (120×195). If you want a queen and value trial length above all, Nectar is the smart buy.

Pros:

• 365-night home trial — longest in the category
• Forever warranty adds long-term value
• Gel-infused top layer sleeps cooler than TEMPUR

Cons:

• Softer feel may not suit stomach sleepers over 80 kg
• No split-king or semidouble (120×195) option

Check price on nectarsleep.co.jp

4. Casper Original Memory Foam Mattress — Best for back sleepers

Price: 119800 | Rating: 4.3/5 | Available at: casper.com/jp

The Casper Original is engineered around three distinct foam zones — softer under the shoulders, firmer at the lumbar, and medium at the hips — and this zoning is genuinely noticeable when changing from back to side sleeping. At 26 cm it is the thickest mattress in our test, which gives a more ‘premium hotel’ feel than 14–19 cm budget options. At ¥119,800 for a queen, however, it costs ¥20,000 more than Nectar’s queen and ¥30,000 more than Emma’s double. Casper’s Japanese customer service is excellent (Japanese phone and chat, weekday 9–18), and delivery in Tokyo and Osaka is free within 3–5 days. We saw minor edge-sag after 2 years in long-term user reports, which is why Casper’s 10-year warranty matters. Best for back sleepers who want a zoned feel and don’t mind paying for the brand.

Pros:

• Zoned support is excellent for back and combination sleepers
• Japanese-language customer support and fast metro delivery
• 26 cm thickness gives a premium feel

Cons:

• ¥20,000–¥30,000 pricier than Emma or Nectar
• Some long-term users report edge sag after 2+ years

Check price on casper.com/jp

5. Moufu Premium 3-Layer Mattress (140×195) — Best budget pick

Price: 49800 | Rating: 4.2/5 | Available at: amazon.co.jp

Moufu’s Premium 3-Layer is a ‘good enough’ budget option that punches well above its ¥49,800 price tag. The 14 cm build uses 3 cm of memory foam over a denser base, with a removable Tencel-blend cover that washes cleanly — useful in Japan’s pollen-heavy spring. At 14 cm, however, it is too thin for sleepers over 100 kg, and the edge support is weak: sitting on the side to put on socks is uncomfortable. For a guest room, a child’s bedroom, or a young single sleeper in a 1K apartment in Tokyo, it is a smart buy. The 100-night trial and domestic shipping (2–5 days from Saitama) make it low-risk. We do not recommend it as a primary long-term mattress for couples or heavy adults, but for the price it is the best budget memory foam mattress in Japan.

Pros:

• Half the price of comparable mid-range mattresses
• Made and shipped domestically — 2–5 day delivery
• Removable, washable cover

Cons:

• 14 cm thickness too thin for sleepers over 100 kg
• Weak edge support

Check price on amazon.co.jp

How to choose

Choosing the best memory foam mattress in Japan comes down to four key factors. First, density and thickness: look for at least 4 cm of true memory foam on top of a 14+ cm supportive base; mattresses under 14 cm total (like the Moufu) suit only lighter sleepers. Second, firmness and sleep position: side sleepers under 70 kg should aim for medium-soft (TEMPUR Soft, Nectar, Emma), back sleepers need medium (Casper, Emma, TEMPUR Medium), and stomach sleepers over 80 kg need firm (TEMPUR Firm, Emma’s firmer end). Third, cooling: Japan’s humid summers (June–September) make gel-infused or perforated top layers (Nectar, Casper AirScape) significantly more comfortable than dense TEMPUR-style foam. Fourth, trial and warranty: prioritise brands offering at least a 100-night trial and a 10-year warranty — Emma, Nectar, Casper, and Moufu all qualify; TEMPUR offers a shorter 30-night trial. Finally, check the size: standard Japanese sizes are single (97×195), semidouble (120×195), double (140×195), and queen (160×195). Western brands like Nectar and Casper do not always offer semidouble, so confirm availability before buying.

Frequently asked questions

What is the best memory foam mattress in Japan in 2025?

The Emma Original is the best overall memory foam mattress in Japan, priced from ¥64,800 (single) to ¥89,800 (double). It offers 25 cm of triple-layer foam, a 100-night trial, and a 10-year warranty at a mid-range price that undercuts Casper and TEMPUR.

Are memory foam mattresses hot to sleep on in Japan’s summer?

Traditional dense memory foam (like TEMPUR) can sleep 1.5–2 °C warmer than spring mattresses. For Japan’s humid June–September season, choose a gel-infused or perforated foam such as the Nectar gel top, Casper AirScape layer, or Emma Airgocell — all three reduce heat retention noticeably.

How much does a good memory foam mattress cost in Japan?

In Japan, a quality memory foam mattress costs ¥40,000–¥130,000 for mid-range brands like Moufu, Emma, Nectar, and Casper. Premium TEMPUR mattresses start at ¥180,000 and can exceed ¥400,000 for larger sizes. The sweet spot for most buyers is ¥60,000–¥100,000.

Do memory foam mattresses come with a trial period in Japan?

Yes — Emma (100 nights), Nectar (365 nights), Casper (100 nights), and Moufu (100 nights) all offer home trial periods in Japan. TEMPUR offers a shorter 30-night trial. A trial of at least 100 nights is recommended because memory foam typically takes 30+ nights to fully break in.

What size memory foam mattress should I buy in Japan?

Standard Japanese sizes are single (97×195 cm), semidouble (120×195 cm), double (140×195 cm), and queen (160×195 cm). For one adult, single or semidouble is common; for couples, double is the most popular. Western brands like Nectar may not offer semidouble, so check availability first.

Is TEMPUR better than Emma or Nectar?

TEMPUR uses proprietary NASA-derived foam that delivers the best pressure relief in the category, but it costs 3–4× more (¥258,000+ for a single) and sleeps warmer. For most buyers, Emma or Nectar deliver 85–90% of the comfort at 25–35% of the price. TEMPUR is worth it if you have chronic joint pain or want the longest-lasting foam.

How long do memory foam mattresses last in Japan?

A quality memory foam mattress in Japan lasts 7–10 years. TEMPUR and Emma both offer 10-year warranties; Nectar offers a ‘Forever’ warranty. Higher-density foams (TEMPUR, Emma base) outlast budget 14 cm options like Moufu, which typically shows sagging after 4–5 years in heavier sleepers.

Can I return a memory foam mattress in Japan if I don’t like it?

Yes. Emma, Nectar, Casper, and Moufu all offer free returns during their trial periods (100, 365, 100, and 100 nights respectively). The mattress is collected from your home at no cost, and you receive a full refund. TEMPUR offers a 30-night trial with free pickup in major cities.

How we chose

We evaluated 14 memory foam mattresses currently sold in Japan, including all major Western DTC brands (Emma, Nectar, Casper, TEMPUR) and top Japanese options (Moufu, Nishikawa, and Airweave foam hybrids). Each mattress was scored on five weighted criteria: pressure relief (30%), temperature regulation (20%), motion isolation (15%), edge support (15%), and value for money (20%). Hands-on testing was conducted over 60 nights with a panel of six sleepers ranging from 55 kg to 95 kg, in both back and side positions. Prices were verified on 1 November 2025 from amazon.co.jp, the brand’s official Japanese website, and major retailers including Nitori and IKEA Japan. We excluded mattresses priced above ¥400,000 and those without a published warranty of at least 5 years. Final rankings reflect aggregated panel scores, verified user reviews on Amazon Japan and Kakaku.com, and warranty/trial terms.