Justa tube is not really just a tube! sure its a black donut, but its a Hypoallergenic black donut, much less likely to cause an allergic reaction than that old truck tube you used to use! the Schrader valve stem is shorter than a standard Auto valve and has a tapered cap, so theres no discomfort or scratching legs. Its made of isobutylene isoprene synthetic rubber, an upgrade from a standard tire tube. Its more resistant to heat, abrasion, ozone and sunlight. Justa tube provides year round fun and is easy to store! its a durable snow tube in winter. In summer, youll enjoy it as a durable River, lake, pool or Ocean float.