Dimensions: 80"L x 60"W x 3"H. Before first use, please lay the topper flat in a ventilated area for 48-72 hours until it is fully expanded. Low temperature may need more time Cooling Gel & Bamboo Charcoal: Our mattress topper with gel-infused memory foam utilizes a special process which is able to adjust the temperature and keep the body optimal cooled all night. Medium firm bamboo charcoal foam provides adaptive comfort and support, also allowing sweat to evaporate easily and keeping the dry Cool & Breathable Cover: To use soft and breathable rayon made from cool fiber, waking up feeling refreshed every night with the cooling topper Pressure-Reliving Comfort: Our memory foam mattress topper will help to evenly distribute weight and protect the spine, comfort and pressure relief by conforming to different body shapes to provide customized comfort Non-Slip & Stay Put: The bottom fabric material is made with a non-slip cloth to increase friction and stay put the position, plus extra straps on the corner of the topper to keep it fit the mattress Machine Washable: Featured with a machine washable cover and zipper, which means you can keep it clean and the topper will last longer to some extent, eliminating the need for frequent disposal of the mattress topper Certified Mattress Topper: Our memory foam mattresses not only have the CertiPUR-US certificate (which measures odor, material, performance, and durability) but also the rigorous certification from OEKO-TEX After-sales Service: ONBRILL is committed to customer satisfaction. If you encounter any issues, please do not hesitate to contact our customer service team. We are fully committed to offering you the perfect service Product Description 1 Cooling cover 2 Cooling memory foam 3 Bamboo charcoal foam 4 Breathable bottom