The Prolimit windsurf session board bag is a unique windsurfing quiver board bag.It features two separate zippered compartments. The windsurf session board bag has a bottom section as Performance board bag bottom and top section as our aero session bag. For all session bags, Prolimit uses the universal wheelbase. The universal base fits all 3 sizes of the windsurf session board bag Improved wheelbase for easy carrying. The wheel Base is optional!