Intex Linking River Run I Tube with Heavy Duty Blue Cover River Tube Cover for 53" Inflatable Sport Tubes with Intex River Run I Tube Cover saves the life of your river float tube. Combined with the included Intex River Run Tube, this is the best river tube available! Allows for use of Quick Connect rope-clip systems to link your Intex tube together. Heavy Duty Construction made for river outfitters. 57" diameter cover allows for 100% full inflation of river tube you put inside, even after initial exposure to sun. SPECS: 1000 denier Micro Mesh bottom lets water pass through while providing superior protection against abrasion by rocks, tree branches, and other debris. 1100 denier vinyl coated canvas top. Total inflated diameter: Approx 50". Be sure to fully inflate river tube inside cover until both are firm and all excess slack is eliminated.