Tough1Mini Blanket LinerLeg StrapsBlackSmall/Medium fits 36in-45inMedium/Large fits 46in-50in33-400M This Mini fleece blanket liner is perfect to go under any sheet or blanket for added warmth with its buckle front, single surcingle belly and two replaceable leg straps that keep it firmly in place. Also, having the security of the leg straps allows this blanket liner to be used as a cooler since the fleece used has moisture wicking properties.Sizing:  Small/Medium fits 36in-45in and the Medium/Large fits 46in-50in