Mountain Hardwear Super Chockstone Hooded Jacket - SS17 Chockstone Imported Double Weave Soft Shell Material - Comfortable and incredible breathable fabric. Abrasion-Resistant - Highly durable jacket. Active Fit - For optimum freedom of movement. UPF 50 - Protects your skin from the suns harmful rays. Secure Zipped Chest Pocket - Allows safe storage for small items such as keys or cash.