To create a lightweight, nimble USA-made hiking boot that can stand up to extreme conditions, Danner collaborated with America's oldest search and rescue organization based in Hood River County, Ore. The Danner Crag Rat Evo has a GORE-TEX liner for waterproof protection, and the engineered synthetic leather and textile upper features highly breathable and abrasion-resistant Perspair side panels. An insulated Aerogel toe cap and crampon-compatible TPU heel clip keep you moving in very low temperatures.FeaturesGore-Tex Waterproof MembranePrimaloft Aerogel Toe Cap Provides Lightweight InsulationRemovable OrthoLite FootbedVibram Mulaz OutsoleTPU Mudguard