Sturdy spring steel construction makes for long lasting fun. Padding over the interior wire makes crawling easy on the hands and knees. Flame retardant 70 Denier Nylon meets CPAI-84 specification. May be used with Pacific Play Tents "Me-Too", "Find-Me" or "Hide-me" series of play tents. Collapses down for easy storage (with securing ties). May be used indoors or outdoors.