Sleep Innovations Gel Memory Foam 3" CustomWave Twin Mattress Topper Sleep Innovations gel memory foam provides the ultimate in comfort, support and stays cool throughout the night; exclusive gel memory foam stays cooler longer Exclusive 2-layer design features a gel memory foam layer and a SureTemp Memory Foam layer Superior comfort and pressure point relief compared to traditional memory foam; improves sleep by reducing tossing and turning caused by painful pressure points 2-in-1 customizable topper designed with separate zippered compartments that allow you to easily arrange the layers for a customized sleep experience After unpacking, allow up to 72 hours for topper to fully expand