It is large, thirty-six inches, and made from sturdy, double-valve, vinyl. The generous size will let you really get comfortable and stretch out, and the sporty design will help you do it in style. Sized for adults. The generous size will let you really get comfortable and stretch out, and the sporty design will help you do it in style. Sized for adults. Step into the water and step into bliss with this inflatable Giant Tire Tube.