COMObaby Infant Toddler Non-Skid Rubber Sole Socks Sole: TPR(Non-toxic, Rubber sole) Fabric: Cotton, Spandex, Polyuretane Flexible foot for easy play, Easy on and off design, Wrapped toe for safety Grippy foot to prevent falls, Durable and washable materials be harmless to the human body because not used an adhesive (hazardous materials) between the fabric material and sole.