100% waterproof and breathable GORE-TEX lining. 400 grams of Thinsulate Insulation offer lightweight warmth for those needing protection in cold climates. Durable nubuc leather upper with rugged and lightweight 100 Denier nylon. Leather toe and heel wrap for abrasion resistance. Speed lace fastening system for secure fit and long lasting performance. Danner/Vibram Rivot TFX outsole for superior grip and mobility featuring 360 lug pattern for increased pivotal movements. Lightweight and stable performance of Danner's TERRA FORCE platform.