Reminiscent of an old school truck inner tube, but without the long valve stem to poke you in the back!That's right, Stream Machine's retro Original Itza Tube is made from heavy-duty butyl rubber so it takes all those bumps and bangs your semi truck inner tube absorbed back in the day, only this tube has a shorter TR15 valve stem for more comfortable floating! Its large, 45" diameter size makes it ideal for lazy days on the river, at the beach or in the pool. And with a valve stem that allows your tube to be filled at a gas station air pump, there's no need to give your lungs such a workout!