NEW A5-6 100% Leather Rubber sole Shaft measures approximately 8 " from arch NUBUCK LEATHER & 1000 DENIER NYLON UPPER For superior abrasion- and scuff-resistance, we use full grain nubuck leather combined with lightweight, breathable Denier nylon. This combination offers some of the best protection in cold and wet environments. USMC CERTIFIED Developed side by side with the United States Marine Corps, the RAT (Rugged All Terrain) earned its name among elite warfighters as being the only proven USMC rugged all terrain boot available. SPEED LACE SYSTEM Our special hardware allows you to tighten from toe to top with one swift tug for a secure, tight fit. Womens SIZES To accommodate more people, we've made this boot in extended sizes. We recommend women select 1.5 to 2 full sizes down for correct fit.( N = Narrow, R = Medium, W = Wide, XW = XXWIDE) VIBRAM 360 DRI ICE OUTSOLE An advanced lug design combined with Vibram's Dri-Ice compound keeps this outsole flexible and stable in extreme cold.