Boot upper construction is an innovative, lightweight microfiber material that is flexible and abrasion-resistant Light microfiber on front and rear bellows provides a more comfortable flex area Toe box is made of synthetic material for high abrasion resistance Extended Polyurethane (PU) synthetic gaiter helps seal out water and dirt Contoured Thermoplastic Polyurethane (TPU) calf guard, TPU higher medial guard, TPU outer lateral ankle guard and TPU heel counter for support and resistance to impacts Rear TPU gaiter patch applied on the top of the TPU calf protector for comfort and impact resistance on the rear flex area Injected TPU shin plate is connected with the TPU medial guard panel Hook-and-loop upper boot closure with TR flap that provides a wide range of fit and support TPU higher medial protector designed with technical texturing for improved grip Biomechanical medial blade system allows good front/rear boot flex and added support and impact resistance for the ankle Ergonomic TPU triple buckle straps wrap smoothly from the front flex and medial guard to the lateral side of the boot without compromising the boot's flexibility Closure system uses three polymer buckles with ratchet closure, buckle memory system and quick release/locking system with a self-aligning design All boot buckles are replaceable One-piece TPU injected dual-compound foot shell is reinforced by a metal shank inside a co-injected toe reinforcement Soft foam surrounds the ankles and boot collar for comfort and shock-absorbing performance Entire boot is textile lined for comfort Replaceable EVA footbed with textile top lining Alpinestars all-terrain sole design with high-grip rubber compounds; sole is replaceable