Alpinestars SP-X Boa Drystar Boots Discover the SP-X BOA Drystar Boots—sleek, sporty, and designed to slip effortlessly under tech riding pants. These mid-height boots are tailored for sport and sport touring riders, offering premium protection and unrivaled walking comfort both on and off the bike. Their upper combines advanced microfiber, ultra-soft Rideknit material, and knitted mesh with seamless thermo-welded parts for a cutting-edge design. Construction: Advanced microfiber and ultra-soft Rideknit calf Front bellow made in Lycra co-injected with soft TPU for enhanced comfort and durability Drystar liner for proven all-weather performance, remaining waterproof while still being highly breathable Integrated PU heel midsole Protection & Safety: TPU heel counter, shift pad, toe slider, and Rotor protection TPU protective parts Internal dual density malleolus impact protection Integrated shin guard Meets CE CE EN13634:2017 standards Comfort: Dedicated side BOA speed closure system engineered for optimal closure and personalized fit Dual heel cushion pads Removable anatomic EVA footbed with Lycra lining Engineered profile for comfort Walking roll and asymmetric heel shape for walking stability