The Alpinestars SP-X BOA Drystar boots are mid-length boots with Alpinestars lateral side entry system incorporating Alpinestars' BOA Speed Lace System technology for a quick, precise, and secure closure. The upper is constructed from a combination of advanced microfibre, knitted mesh, and co-injected TPU with Lycra, making it ultra-lightweight and durable. The Alpinestars exclusive Drystar membrane is breathable and waterproof for use in all weathers. A lateral adjustable hook and loop closure system at the shin plate with a TPU 3D print on the strap gives the perfect personalised fit. CE certified to EN 13634:2017, the SP-X BOA Drystar boot offers a TPU heel counter design, dual-density ankle protectors and internal shin reinforcement for impact protection. The gear change reinforcement in TPU offers additional protection. The front bellow is constructed in a Lycra co-injected with a soft TPU for enhanced comfort and protection. Equipped with a 3D mesh lining for high levels of breathability with micro suede on the heel, these give anti-sliding performance. The sport's sole has a high-flex inner structure (lasting insole) for superior walking comfort. It is made from rubber with a special compound for excellent grip and absorption, and an integrated support shank enhances sole rigidity. A removable anatomic EVA footbed with Lycra lining on the top offers supreme support and comfort.