DUP Alias Wakeboard BootsDouble Up Alias Wakeboard Boots Taking everything Double Up have learnt over the years in binding construction and fusing them with a soft floating tongue design makes this a great fitting boot across a variety of different sizes. Featuring medium Soft PU Upper, Neoprene flex zones and comfortable integrated Liner Shell, provides support and comfort while the Stage 1 Chassis give you a true feel with maximum impact absorption Available Sizes: 5 9, 7