--- product_id: 216537469 title: "Serta ThermaGel 3-Inch Gel Memory Foam Mattress Topper, King" brand: "serta" price: "¥102726" currency: JPY in_stock: false reviews_count: 13 url: https://www.desertcart.jp/products/216537469-serta-thermagel-3-inch-gel-memory-foam-mattress-topper-king store_origin: JP region: Japan --- # CertiPUR-US certified durable foam 3-inch gel-infused cooling foam Full King size 79x75 inches Serta ThermaGel 3-Inch Gel Memory Foam Mattress Topper, King **Brand:** serta **Price:** ¥102726 **Availability:** ❌ Out of Stock ## Summary > ❄️ Sleep Cooler, Feel Better, Upgrade Smarter! ## Quick Answers - **What is this?** Serta ThermaGel 3-Inch Gel Memory Foam Mattress Topper, King by serta - **How much does it cost?** ¥102726 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/216537469-serta-thermagel-3-inch-gel-memory-foam-mattress-topper-king) ## Best For - serta enthusiasts ## Why This Product - Trusted serta brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Breathable & Safe:** Ventilated design with CertiPUR-US certification ensures low VOC emissions, durability, and trusted safety. - • **Effortless Upgrade:** Fits standard King frames, platform beds, and adjustable bases—just pull on and enjoy premium comfort tonight. - • **Deep Pressure Relief:** 3 inches of contouring memory foam cushions hips, shoulders, and lower back for restorative, pain-relieving sleep. - • **Stay Cool All Night Long:** ThermaGel technology actively dissipates heat across the entire King bed surface, perfect for hot sleepers and couples. - • **Extend Your Mattress Life:** Softens firm or aging mattresses, saving you replacement costs while upgrading comfort instantly. ## Overview The Serta ThermaGel 3-Inch Gel Memory Foam Mattress Topper for King beds combines advanced cooling gel technology with deep pressure-relieving memory foam. Designed to fit standard King mattresses, it softens firm surfaces and extends mattress life while providing breathable, CertiPUR-US certified foam for safe, durable comfort. Ideal for couples and hot sleepers seeking a cooler, more restorative night's sleep. ## Description "Sleeping hot or dealing with pressure discomfort on your King mattress? The Serta ThermaGel 3-Inch King Gel Memory Foam Mattress Topper delivers targeted cooling and deep pressure relief across the full width of your bed. The ThermaGel-infused foam actively dissipates body heat to keep the sleep surface cooler and more comfortable throughout the night , a meaningful benefit for couples or single sleepers who tend to sleep warm. At 3 inches, the topper conforms precisely to the body's natural curves, cushioning the hips, lower back, and shoulders for back pain relief, deeper plush feel, and more restorative sleep across the full King width. Ventilated, breathable construction supports airflow for all sleep positions. Made in the USA with CertiPUR-US certified foam for trusted safety, durability, and low emissions. Softens a firm or aging King mattress and extends its useful life. Designed for standard King bed frames, platform beds, and adjustable bases, this thick mattress topper layers seamlessly under existing bedding with no additional setup required. Upgrade your King bed today. Add to cart and experience cooling, pressure-relieving comfort from Serta ThermaGel. ThermaGel is a trademark of Leggett & Platt, Inc." Review: Great value Great topper!! - EXACTLY what i wanted. My family bought me a similar Serta topper 5 yrs ago after a major surgery. My matress has seen better days. The first one was very comfortable and I was still using it but my large dog digs at the bed before laying down and did rip it. Honestly, the first one was a little too soft. I had a full open abdominal so those muscles were cut and I have bad joints , so sitting up can be tricky. I found you sink in and had to actually roll to get up. This Serta topper is much more comfortable & much easier to get up from because all though soft, it is firmer. It bounces right back after you get up. . It gives but doesn't make you sink. This helps sleeping when you have joint pain. I didnt feel as hot with it as much as the first either but could just be me. It came in a solid box ,( grandkids LOVE the box with the sheep and large flaps lol) compressed, well wrapped and in a duffle bag. It was fully expanded as soon as I opened it. I didnt notice any smells. This was the best sleep I've had in a long time and at this price I've considered buying an extra when it inevitably rips and wears down but I've read some reviews online that toppers didn't fully expanded after stored a long time. Ill just enjoy this till it dies and replace it then. It was very fast shipping also. I HIGHLY RECOMMEND THIS & WILL buy again! Review: Great on my firm mattress. - I love it so far. I am 6 foot two 290 pounds and my bed was rather stiff, causing my arms to fall asleep with my shoulder above my head. Since I’ve added this pillow topper, I am not having that problem as much. I’m sleeping a lot better. I say this works better on a firmer mattress. If you have a soft mattress, I think it would swallow you up to add this. Just my opinion. ## Features - STOP SLEEPING HOT ACROSS YOUR FULL KING BED: Cooling gel-infused memory foam pulls body heat from the entire King sleep surface all night , a meaningful benefit for couples or hot sleepers. ThermaGel cooling dissipates heat. - DEEP PRESSURE RELIEF: 3 inches of contouring memory foam delivers deep plush feel and substantial cushioning at the hips, shoulders, and lower back across the full King width for back pain relief and restorative sleep. - SOFTENS A FIRM OR AGING KING MATTRESS: This thick gel memory foam mattress topper conforms closely to the body and extends the life of an older King mattress, without replacement cost. - BUILT TO TRUST: CertiPUR-US certified foam, with ventilated, breathable design. Tested for low VOC emissions, durability, and content safety. Sized 75 x 79 inches for standard King bed frames, platform beds, and adjustable bases. - IDEAL FOR PRIMARY BEDROOMS WHERE BOTH PARTNERS NEED COOLER, DEEPER COMFORT: A reliable thick King mattress topper for couples. Pair under a standard fitted sheet. Add to cart and experience the comfort tonight. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0889898S8 | | Age Range Description | Adult | | Best Sellers Rank | #54,220 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #126 in Mattresses Toppers | | Brand | Serta | | Brand Name | Serta | | Closure Type | Pull On | | Color | White | | Customer Reviews | 4.3 out of 5 stars 10,715 Reviews | | Fabric Type | 100% Memory Foam | | Item Display Dimensions | 3 inches | | Item Firmness Description | Soft | | Item Highlight | 3 inch king gel memory foam mattress topper, ThermaGel cooling, deep pressure relief, CertiPUR-US certified | | Item Type Name | Serta ThermaGel Memory Foam Mattress Topper | | Manufacturer | Elite Comfort Solutions | | Manufacturer Part Number | 12275 | | Material Type | Cotton | | Model Name | Serta ThermaGel Cooling | | Model Number | 12 | | Number of Items | 1 | | Number of Packs | 1 | | Other Special Features of the Product | Breathable, Cooling, Durable, Premium, Pressure Relief | | Product Care Instructions | Spot Clean Only | | Size | King 79"x75" | | Special Feature | Breathable, Cooling, Durable, Premium, Pressure Relief | | UPC | 094325278879 | | Unit Count | 1 Count | | Water Resistance Level | Not Water Resistant | ## Product Details - **Brand:** Serta - **Color:** White - **Fabric Type:** 100% Memory Foam - **Size:** King 79"x75" - **Special Feature:** Breathable, Cooling, Durable, Premium, Pressure Relief ## Images ![Serta ThermaGel 3-Inch Gel Memory Foam Mattress Topper, King - Image 1](https://m.media-amazon.com/images/I/919fn1VWB+L.jpg) ![Serta ThermaGel 3-Inch Gel Memory Foam Mattress Topper, King - Image 2](https://m.media-amazon.com/images/I/71jsSPpKDpL.jpg) ![Serta ThermaGel 3-Inch Gel Memory Foam Mattress Topper, King - Image 3](https://m.media-amazon.com/images/I/71vPqyyrxJL.jpg) ![Serta ThermaGel 3-Inch Gel Memory Foam Mattress Topper, King - Image 4](https://m.media-amazon.com/images/I/71kB5qC9PaL.jpg) ![Serta ThermaGel 3-Inch Gel Memory Foam Mattress Topper, King - Image 5](https://m.media-amazon.com/images/I/71eU9Y35grL.jpg) ## Available Options This product comes in different **Size, Set** options. ## Questions & Answers **Q: Will the quality depreciate over time and is there a warranty on this topper?** A: We have tested our products over a 10 year cycle and don't see any significant degradation of the product. Our Serta toppers don't have a specific warranty, but we have partnered with Amazon to replace the product or refund your purchase if you are not happy with the performance. **Q: Why is this $100 but the same model at kohls $400?** A: I just got the one sold at Kohls after returning this one. On sale from $400 for $174 online. This isn’t the same product. The Khols mattress topper is much heavier, comes with a cover and the packaging was much better. **Q: i sleep cold, will this keep me warm?** A: Actually, just received ours 2 days ago. I slept on it last night. It was very comfortable and my back never felt better but it was HOT! I sleep cold too. **Q: Is this certipur-us certified?** A: yes. All Serta products certipur-us certified. Check this link https://www.serta.com/standards ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great value Great topper!! *by T***T on September 27, 2025* EXACTLY what i wanted. My family bought me a similar Serta topper 5 yrs ago after a major surgery. My matress has seen better days. The first one was very comfortable and I was still using it but my large dog digs at the bed before laying down and did rip it. Honestly, the first one was a little too soft. I had a full open abdominal so those muscles were cut and I have bad joints , so sitting up can be tricky. I found you sink in and had to actually roll to get up. This Serta topper is much more comfortable & much easier to get up from because all though soft, it is firmer. It bounces right back after you get up. . It gives but doesn't make you sink. This helps sleeping when you have joint pain. I didnt feel as hot with it as much as the first either but could just be me. It came in a solid box ,( grandkids LOVE the box with the sheep and large flaps lol) compressed, well wrapped and in a duffle bag. It was fully expanded as soon as I opened it. I didnt notice any smells. This was the best sleep I've had in a long time and at this price I've considered buying an extra when it inevitably rips and wears down but I've read some reviews online that toppers didn't fully expanded after stored a long time. Ill just enjoy this till it dies and replace it then. It was very fast shipping also. I HIGHLY RECOMMEND THIS & WILL buy again! ### ⭐⭐⭐⭐⭐ Great on my firm mattress. *by F***0 on October 18, 2026* I love it so far. I am 6 foot two 290 pounds and my bed was rather stiff, causing my arms to fall asleep with my shoulder above my head. Since I’ve added this pillow topper, I am not having that problem as much. I’m sleeping a lot better. I say this works better on a firmer mattress. If you have a soft mattress, I think it would swallow you up to add this. Just my opinion. ### ⭐⭐⭐⭐⭐ Great quality mattress *by J***G on August 19, 2026* Great memory foam mattress for the price. This is a great alternative to replacing my whole mattress. Great quality mattress, so comfortable and soft. The mattress doesn’t move around when I sleep which is awesome. My back pain is gone. Definitely recommend this mattress. ## Frequently Bought Together - Serta ThermaGel Cooling, Pressure-Relieving Memory Foam Mattress Topper, 3 Inch, King,Blue - SafeRest 100% Waterproof King Size Mattress Protector - Fitted with Stretchable Pockets - Machine Washable Cotton Mattress Cover for Bed - EASELAND King Size Mattress Pad Pillow Top Mattress Cover Quilted Fitted Mattress Protector Cotton 8-21" Deep Pocket Cooling Topper (78x80 Inches, White) --- ## 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/216537469-serta-thermagel-3-inch-gel-memory-foam-mattress-topper-king](https://www.desertcart.jp/products/216537469-serta-thermagel-3-inch-gel-memory-foam-mattress-topper-king) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-11-01*