adidas Outdoor Women's Terrex Fast X GTX Hiking Shoes Synthetic Textile Upper - Allows air to permeate the exterior providing breathability. Synthetic Overlays - Diminish undue weight whilst maintaining durability. GORE-TEX Lining - For waterproof, breathable performance. ADIPRENE+ - In the forefoot, maintains propulsion and efficiency. OrthoLite - Antimicrobial moisture-wicking sockliner.