The O'Brien GTX Wakeboard Boot features a medium/stiff flex pattern. Ultimate adjustability comes from its 3-way convertible design - ride with dual laces, dual laces and Velcro cuff, or single lace forefoot plus Velcro strap on the upper cuff. Integrated TPU ankle strap provides superior hold by pulling your foot into the heel pocket. Ultralight liner. Therma-welded upper for minimal weight, maximum drainage, and breathability. The 2.5° canted chassis of the GTX boot eases stress on your legs. Power arch supports your arch on bigger landings. Traditional thick laces provide the most secure fit and durability so your boots won't loosen up while riding. GTX Boot sizes: XS(4-6), S(6-8), M(8-10), L(9-11), XL(11-13), 2XL(12-14).