The SHEEX® mattress cooling pad will make you feel cool in ten minutes, no electricity required. When you fall asleep your body temperature naturally drops to help you achieve a better nights rest. Traditional bedding traps heat which can increase your body temperature and disrupt your sleep. This performance-engineered, environmentally-friendly cooling pad insures that you will be comfortable in all climates for an optimal night's sleep. This can be used on top of a fitted sheet or underneath. Outer material is 100% polyester with PVC coating. Measures 35" W x 55" L. Hand wash only. Imported.