Product Description: Designed for riders who want a lightweight, powerful ride that is still playful enough to butter and tweak. Built with the reliable performance of our Full Wrap platform and medium flexing PureFlex ankle straps, our all-new Fast Entry Straps and Bomb Proof Buckles, the 390 Boss is the versatile binding creative snowboarding craves. Features: Rome&';s bombproof chassis; designed for durability, maximum power transfer, and stability at speeds. The Ultra Flex ankle straps powered by Aux Tech are designed for new levels of locked-in comfort and support This open edge creates an even pressure distribution on the boot while still allowing for a full range of tweak ability that freestyle riding craves. Created to help fit a wider range of boot models and sizes.