The Justa tube is hypoallergenic black donut, designed to look like the ol' favorite truck tires people have lounged on for years. Features Schrader valve stem with tapered cap, so there's no scratching on your legs. Made of isobutylene isoprene synthetic rubber, the Justa tube will resist heat, abrasion, and UV rays. Also serves as a durable snow tube in the winter. 170-lb. weight limit. 40" diameter (deflated).