A waterproof winter running shoe with Gore-Tex upper, water repellent gaiter and integrated spikes for maximum grip. Designed for extreme use on extremely slippery, icy, muddy or snowy terrain, it is ideal for competitions and off-road training during the winter months thanks to the sticky FriXion Blue compound with integrated AT Grip Fixed Spikes . The Sock-Shield Gaiter™ protects against the entry of stones and mud and the fast and intuitive Single Cord Lacing System with a retractable lace pocket speeds up operations. The high frequency, Fusion Gate Technology reinforcement structure connected to the lacing system gives structure and allows a snug fit and volume adjustment for precise and stable running on traverses. The total absence of external stitching and the super flexible, waterproof and breathable Gore-Tex membrane, make Blizzard GTX the ideal choice for winter off-road trail and mountain running.