Sitting back on heavy duty river tubes for floating to beat the heat in summer. Enjoy the exciting skiing on the slopes in winter with heavy duty snow tubes for sledding! Inner tubes for river floating measure 36 in diameter. The max bearing weight is 180lbs. The one-way inflation valve does not allow air leakage. And safe valve cap protects you from scrapes & bruises. Moreover Rubber tubes also can be used as truck tire tubes.