--- product_id: 75208237 title: "Hypnia 8 inch Memory Foam Mattress, King Size 5ft x 6ft6, 2 inch Memory Foam" brand: "hypnia" price: "¥278692" currency: JPY in_stock: false reviews_count: 8 url: https://www.desertcart.jp/products/75208237-hypnia-8-inch-memory-foam-mattress-king-size-5ft-x store_origin: JP region: Japan --- # Hypnia 8 inch Memory Foam Mattress, King Size 5ft x 6ft6, 2 inch Memory Foam **Brand:** hypnia **Price:** ¥278692 **Availability:** ❌ Out of Stock ## Quick Answers - **What is this?** Hypnia 8 inch Memory Foam Mattress, King Size 5ft x 6ft6, 2 inch Memory Foam by hypnia - **How much does it cost?** ¥278692 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/75208237-hypnia-8-inch-memory-foam-mattress-king-size-5ft-x) ## Best For - hypnia enthusiasts ## Why This Product - Trusted hypnia brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Description Originally developed by the world's leading scientists at NASA, memory foam has now been adapted to provide the ultimate mattress solution. Memory foam reacts to the warmth of your body and contours to your shape in any position, supporting the areas that need it most allowing you to drift off into deep, high quality sleep. By doing this the pressure of your weight on the mattress is spread over a larger surface area which reduces pressure points and improves blood flow. Memory Foam will always remember its original shape and return to its normal size after each excellent night�s sleep. Review: Too good to be true! - Like most people I saw the price of this mattress, the free pillows and wondered.. It didn't help, there was an odd bad review (And it did read oddly!) and a comment about all the reviewers having only ever having made one review. So I was sceptical. Anyway, I bought one. So here is my review: DELIVERY - very fast, even though it was Christmas. It came 3 days earlier than initially predicted. It came in a box about 5 foot tall and 4 foot by 4. It is quite heavy so I would suggest two people are needed for this. A negative is the box itself was dirty from storage and my pale bue shirt was dirty once I carried it up stairs. This is a very minor negative. You then need to take the plastic wrapping off the rolled up mattress - this is when your heart sinks and you feel you know why it is so cheap! Initially the mattress is 3-4 inches! Worry not - once it is unfurled it starts to expand. I left mine for 9 hours before actually it. The mattress itself comes in a really nice cover and looks very nice. The pillows are very small and dont really fit well in pillow cases - but they are free! (Read on to hear about the pillows though!) THE PRODUCT Amazing - I love the mattress. I must admit I still harbour thoughts of why it was so cheap and expect to wake up one morning and find the mattress flat! But it is great. It is very different from the sprung mattress I had previously but I have found no difficulty sleeping on it and have found so far that I seem to be sleeping a longer unbroken sleep - this could just be my imagination as I when i got tit I was just finishing 2 weeks Christmas holidays so the unbroken sleep could be due to working. The pillows are great too - I can see they won't be for everybody but I have found them very comfortable just they aren't aesthetically pleasing due to their size compared to 'normal' pillows. Initially I went to sleep with a normal pillow with a memory foam pillow underneath - since then I just use one memory foam pillow - previously I used two normal pillows. Smell - the mattress does smell - not the worst smell in the world but it does smell a bit after five days. SUMMARY I am loving my new mattress - still worried at the back of my mind that it was too good to be true but as each day (Night) goes by I sleep more and more soundly in the belief I got a great bargain! UPDATE 2nd January 2013 The bed is still great - I don't use the pillows though. Review: King memory foam mattress - The mattress arrived very quickly. I ordered it on January 2 and it was with us by January 4. The mattress was very carefully and professionally wrapped. Not too difficult to unwrap. It expanded for over twelve hours. I have severe asthma but the odour from it did not bother me. There actually wasn't much odour. The pillows were wrapped up in the mattress and were as flat as boards. They expanded very quickly. Neither of us can really get on with the pillows but they were free. Our real objective was to purchase the mattress so we did not care about the pillows. The mattress cover is substantial and beautifully soft. We are sleeping very happily and comfortably. Our only problem is not wanting to get out of bed in the mornings!! We did check two national mattress-bed sales rooms. They were asking £400 for a similar mattress which was not as well made. The layers in their mattresses were not as well joined as the Hypnia mattress. The cover not as nice and there were charges for delivery. We really appreciated the free delivery of our Hypnia mattress. Altogether a very pleasant transaction. I would certainly recommend the Hypnia mattress to anyone seeking a superb product at most reasonable terms and with loads of comfort built in. ## Features - King Size 5ft x 6ft6 / 150cm x 200cm - Total Depth: 8 inch - Memory Foam Depth: 2 inch - Density: 75 kg/m3 - Comfort Rating: Medium - Firm - Includes Removable Washable CoolSoft Cover - Hypoallergenic, Dust and Dust Mite Resistant, Non Turn ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B007H4G0OC | | Benefits | Pressure Relief | | Brand | HYPNIA | | Brand Name | HYPNIA | | Colour | White | | Construction Type | Foam | | Customer Reviews | 4.0 out of 5 stars 81 Reviews | | Fill Material | Memory Foam | | Fill material | Memory Foam | | Global Trade Identification Number | 05060303820045 | | Item Firmness Description | Medium | | Item Type Name | Memory Foam | | Item firmness description | Medium | | Manufacturer | Hypnia | | Manufacturer Part Number | K8B-2P | | Manufacturer Warranty Description | 10 year manufacturer warranty. | | Material Type | Polyurethane | | Mattress Comfort Layer Material | Memory foam | | Model Name | Memory Foam | | Model Number | K8B-2P | | Portable | No | | Product Care Instructions | Machine Wash Cover 30 Degrees | | Size | UK King (150 x 200 cm) | | Special Features | Hypoallergenic | | Special feature | Hypoallergenic | | Style Name | Modern | | Top style | Tight Top | | top-style | Tight Top | ## Images ![Hypnia 8 inch Memory Foam Mattress, King Size 5ft x 6ft6, 2 inch Memory Foam - Image 1](https://m.media-amazon.com/images/I/91SpmcTIGzL.jpg) ![Hypnia 8 inch Memory Foam Mattress, King Size 5ft x 6ft6, 2 inch Memory Foam - Image 2](https://m.media-amazon.com/images/I/81nMe6ivHbL.jpg) ![Hypnia 8 inch Memory Foam Mattress, King Size 5ft x 6ft6, 2 inch Memory Foam - Image 3](https://m.media-amazon.com/images/I/81xb4E+iowL.jpg) ![Hypnia 8 inch Memory Foam Mattress, King Size 5ft x 6ft6, 2 inch Memory Foam - Image 4](https://m.media-amazon.com/images/I/81OCGgW57QL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Too good to be true! *by L***S on 8 January 2012* Like most people I saw the price of this mattress, the free pillows and wondered.. It didn't help, there was an odd bad review (And it did read oddly!) and a comment about all the reviewers having only ever having made one review. So I was sceptical. Anyway, I bought one. So here is my review: DELIVERY - very fast, even though it was Christmas. It came 3 days earlier than initially predicted. It came in a box about 5 foot tall and 4 foot by 4. It is quite heavy so I would suggest two people are needed for this. A negative is the box itself was dirty from storage and my pale bue shirt was dirty once I carried it up stairs. This is a very minor negative. You then need to take the plastic wrapping off the rolled up mattress - this is when your heart sinks and you feel you know why it is so cheap! Initially the mattress is 3-4 inches! Worry not - once it is unfurled it starts to expand. I left mine for 9 hours before actually it. The mattress itself comes in a really nice cover and looks very nice. The pillows are very small and dont really fit well in pillow cases - but they are free! (Read on to hear about the pillows though!) THE PRODUCT Amazing - I love the mattress. I must admit I still harbour thoughts of why it was so cheap and expect to wake up one morning and find the mattress flat! But it is great. It is very different from the sprung mattress I had previously but I have found no difficulty sleeping on it and have found so far that I seem to be sleeping a longer unbroken sleep - this could just be my imagination as I when i got tit I was just finishing 2 weeks Christmas holidays so the unbroken sleep could be due to working. The pillows are great too - I can see they won't be for everybody but I have found them very comfortable just they aren't aesthetically pleasing due to their size compared to 'normal' pillows. Initially I went to sleep with a normal pillow with a memory foam pillow underneath - since then I just use one memory foam pillow - previously I used two normal pillows. Smell - the mattress does smell - not the worst smell in the world but it does smell a bit after five days. SUMMARY I am loving my new mattress - still worried at the back of my mind that it was too good to be true but as each day (Night) goes by I sleep more and more soundly in the belief I got a great bargain! UPDATE 2nd January 2013 The bed is still great - I don't use the pillows though. ### ⭐⭐⭐⭐⭐ King memory foam mattress *by M***R on 19 January 2012* The mattress arrived very quickly. I ordered it on January 2 and it was with us by January 4. The mattress was very carefully and professionally wrapped. Not too difficult to unwrap. It expanded for over twelve hours. I have severe asthma but the odour from it did not bother me. There actually wasn't much odour. The pillows were wrapped up in the mattress and were as flat as boards. They expanded very quickly. Neither of us can really get on with the pillows but they were free. Our real objective was to purchase the mattress so we did not care about the pillows. The mattress cover is substantial and beautifully soft. We are sleeping very happily and comfortably. Our only problem is not wanting to get out of bed in the mornings!! We did check two national mattress-bed sales rooms. They were asking £400 for a similar mattress which was not as well made. The layers in their mattresses were not as well joined as the Hypnia mattress. The cover not as nice and there were charges for delivery. We really appreciated the free delivery of our Hypnia mattress. Altogether a very pleasant transaction. I would certainly recommend the Hypnia mattress to anyone seeking a superb product at most reasonable terms and with loads of comfort built in. ### ⭐ DO NOT, ADN I MEAN - DO NOT RISK BUYING FROM THEM!!! *by P***O on 11 September 2014* I have been back and forth with the GM of the company to return the item ever since I got it. I had previously bought the exact matress but for some reason this time, the one I received was larger than my bed and doesnt fit properly leaving it slanted on one side. This was in April!!! I ended up having to send him a video of the matress not fitting into my bed and corresponding through 'Whatsapp' (???!!!!), now lately I am getting no replies.... This has been the worst possible customer service I have ever seen, I can vouch for that, especially because customer service and satisfaction is exactly my line of business, appauling. Really if for some reason your product is different from what is described and you want an exchange/refund/whatever - you will not get one!!! I am not one to post bad reviews or complain but this is just too much, who - after 5 months of correspondence - could not give less of a c**p about their customers??? Are £180 quid really worth that much more to them? This may work in the short run, but with this customer service from the MANAGER, this company is not going to be around for long... DO NOT BUY FROM THIS COMPANY, BECAUSE IF YOU DO AND THE PRODUCT IS NOT WHAT YOU WISHED FOR - THEY WILL NOT EXCHANGE IT/REFUND IT. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.jp/products/75208237-hypnia-8-inch-memory-foam-mattress-king-size-5ft-x](https://www.desertcart.jp/products/75208237-hypnia-8-inch-memory-foam-mattress-king-size-5ft-x) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-07-31*