DESCRIPTION: The Ridgeline is a classically styled leather mountaineering boot designed with forest management and post-fire cleanup work in mind. The super-durable roughout leather upper and Vibram® Fire & Ice sole make it worthy for burly treks with heavy packs over rugged terrain in extreme conditions. FEATURES: Heat resistant sole with a rubber compound that is resistant to 482°f and a glue that is resistant to 215°f. Heat resistant heel and toe counters for better protection in wildland firefighting conditions. Minimum 8 inch height meets federal standards for wildland firefighting. Laces and exterior threads are fire resistant, made from Nomex®. Interior air-mesh liner is highly breathable for long days in the field. Not intended for front-line wildfire work SPECIFICATIONS: ITEM: 31LSIZES: 38 - 48WEIGHT: 32.1 oz / 910 gLAST: Makalu UPPER: 3mm Idro-Perwanger Roughout Leather / Removable EZ-Flex tongueLINING: Abrasion Resistant 3D Air-MeshINSOLE: 8mm MtnFlex with 1.5 mm Dacromet-coated half steel shankMIDSOLE: PU Air-cushionSOLE: Vibram® Fire & Ice Outsole (ISO 20344 Certified)FIT: Wide WE RECOMMEND GOING UP A HALF SIZE AS ALL LASPORTIVA BOOTS TEND TO RUN A HALF SIZE SMALLER. VIEW LA SPORTIVA MOUNTAIN BOOT COMPARISON CHART