High-performance inForm Tundra last has a snug fit. we suggest sizing up for optimal warmth and comfort. The Vibram rubber outsole provides sure-footed traction and long-wearing durability. Boa System allows precise fit adjustments even while wearing heavy gloves. Removable, felt-lined neoprene inner bootie provides enhanced insulation to retain warmth. Durable upper with waterproof membrane keeps feet warm and dry. GnarGuard rubberised toe and heel bumpers protect against abrasions and fight debris.