The F4.0 is the most advanced Salomon boot to date both in performance and looks. This space age looking boot boasts a unique Wrap lock lacing system that requires only one external lace that is fast and effective. One pull is all it takes to quickly fasten up and youâ€™re off. It also uses a very low profile outsole unit that gets you closer to your board, and when combined with some of the lower profile bindings on the market really heightens board feel. The flex of the F4.0 is high on the support spectrum, offering you great response for stability when riding really fast.