Supportive & Comfortable - Niva gel-infused memory foam reduces overheating and adds a layer of comfort to give your mattress a new lease of life. The double mattress topper upgrades your old and tired mattress, without the cost of a replacement - perfect for a restful and deep sleep. Clean, Safe & Certified - Slumberdown memory foam topper is made without harsh chemical flame retardants for a healthier sleep environment. Its CertiPUR certified and hypoallergenic - a cleaner, safer memory foam you can trust to sleep on every night. British Craftsmanship - Sleep Soundly knowing our mattress toppers are designed and lovingly made in the UK unlike other cheaper alternatives, ensuring the highest level of quality and attention to detail. We have got a solid 2-year guarantee to back it up! Knitted Washable Cover - This double memory foam mattress topper features a plush knitted cover with breathable mesh sidewalls that releases trapped heat - keeping you cool and dry. Simply unzip and machine wash at 40°C to keep your topper fresh and clean. Secure Elasticated Straps - Slumberdown orthopedic mattress topper is made with four strong corner straps that anchor the topper firmly to your mattress, even if you move in your sleep - No sliding. No bunching. Just consistent comfort, night after night. You may notice a new foam smell when you first unpack your mattress - it’s normal for a good quality memory foam and completely harmless. This will fade after 24-48 hours of airing in a well-ventilated room, leaving you ready to enjoy a better night’s sleep.