Alpinestars Faster 4 Shoes Drawing on decades of R&D experience at the highest levels of motorsports, Alpinestars incorporates cutting-edge performance innovations into the Faster 4 shoes. The shoes' seamless knitted construction ensures exceptional lightness and breathability, while delivering class-leading protection both inside and out. Medial dual-density ankle protectors positioned between the upper and padded lining and thermoplastic rubber (TPR) on the later calf, slider, toe box and heel counter provide optimal protection and comfort. The Faster 4 shoes are as flexible as they are protective thanks to a back flexion point constructed from soft microfiber, soft rear collar construction and heel-dampening midsole with integrated shank. Construction: Advanced microfiber upper Seamless thermo-welded panels 3D mesh lining for breathability Anti-sliding microsuede on heel Back flexion point constructed from soft microfiber to improve both back flexion and back protection Medial quarter with dedicated seamless combined with soft TPU area provides added structure and comfort Protection & Safety: Medial dual-density ankle protectors are positioned between the upper and padded lining Enhanced TPU ankle extended in lower lateral area TPR on lateral calf and slider TPR slider details on the lateral toe box provide enhanced flex and protection TPR heel counter Asymmetric toe design for protection in shift area Optimized rubber sole compound provides textured grip, excellent absorption CE certified to EN 13634:2017 standards Comfort: Rear collar construction made of soft textile for enhanced comfort and improved back flexion Tongue and collar padding  Traditional lace closure system Ergonomic TPR strap with lateral adjustable hook and loop closure system Integrated shank in sole for support and durability Heel-dampening midsole Replaceable anatomical EVA footbed with Lycra lining on top