"Designed to refresh the feel of your bed without replacing the mattress, the Lavio cooling gel memory foam mattress topper adds an extra-thick layer of comfort for everyday bedrooms, guest rooms and rental homes. Its dual-layer construction combines cooling gel memory foam with bamboo charcoal memory foam to support a more comfortable night’s sleep. A breathable knitted fabric cover brings a soft finish, while the non-slip base and four adjustable elastic corner straps help keep the topper securely in place. Supplied vacuum packed for transport, it needs time to expand and return to its original shape before use. Key features Extra thick 4 inch mattress topper Dual-layer structure: 2 inch cooling gel memory foam and 2 inch bamboo charcoal memory foam Designed to upgrade comfort and support without replacing your mattress Breathable knitted fabric cover Non-slip base for a secure fit Four adjustable elastic corner straps Removable zip cover Machine-washable cover Vacuum packed; allow 48-72 hours for full expansion Dimensions Double: 190x135x10cm (LxWxH) Small Double: 190x120x10cm (LxWxH) King: 200x150x10cm (LxWxH) Please note: Colours shown are as accurate as possible, though may vary slightly depending on your screen settings."