If you suffer from back pain, and your old mattress has you waking achy, a mattress topper can be a great investment to help align the contours of your spine without investing in a new mattress. Strap them to your existing mattress, combined with a healthy sleep routine, can help you alleviate pain, sleep better, and wake with more energy.We recommend mattress toppers for the extra support and comfort for your joints, but also to prolong the life of your mattress. Noting that because people often buy a mattress without sleeping on it first, it’s common to end up with something that doesn’t feel right. Toppers allow you to change your sleep setup, without tossing your mattress. This cloud memory foam mattress topper uses R-C type memory foam as its inner foam, for its excellent performance in softness and comfort than other materials. Enjoy a cloud-like sleep, and relax your head, neck, shoulders, back, hips, legs, and whole body to the greatest extent.Before first use, lay the mattress flat in a well-ventilated area for 48-72 hours until it is fully expanded (do not expose it to sunlight). If it has not yet finished expanding, use a vacuum cleaner or hair dryer to make it expand; during this time you can dab the foam with your hands (without getting too hot or applying too much pressure).The inner foam is not washable, but the cover can be removed for cleaning. The package only contains a mattress topper and a topper cover. Keep it out of sunlight when you don't need to use it. Size Twin Size, Full Size, Queen Size, King Size Product Dimensions Twin:  75.2 x 38.2 x 3 inchesFull: 75.2 x 53.2 x 3 inchesQueen: 80 x 60 x 3 inches King: 80 x 76 x 3 inches Item Weight Twin: 12.03 poundsFull: 17.21 poundsQueen: 20.2 poundsKing: 25.13 pounds Material Memory Foam Special Feature Adjustable, Durable, Premium Fabric Type Breathable Viscose Cover Color White Product Care Instructions Machine Wash Closure Type Zipper Water Resistance Level Not Water Resistant Age Range (Description) Adult