Double duty summer river tube and winter inflatable snow sled. Made of heavy duty, tear resistant, rubber like the tubes The River rafting companies rent out. Much more puncture resistant than vinyl snow tubes. This inner tube is UV protected so the sun won't harm the tube and cause it to deflate prematurely. No more being poked with one of those long metal stems from truck tire tubes. Low profile safety Valve stem and safety cover are designed to protect you from scrapes. For top speed on snow and best flotation, be sure to fully inflate to 48" Diameter. For even more speed on snow, apply a light coat of ski wax.