READY FOR ANY MISSION, ANY ENVIRONMENT, ANY TIME. Developed side by side, the RAT (Rugged All Terrain) earned its name among elite warfighters as being the only proven rugged all-terrain boot available. Precisely crafted with highly durable nubuck leather, a tear-resistant 1000 Denier nylon, an abrasion-resistant polyurethane reinforced heel and toe cap, and an advanced Vibram 360 Dri Ice outsole, the RAT embodies Danner's commitment to crafting higher standards. We recommend women select 1.5 to 2 full sizes down for correct fit. Please be aware that these boots tend to run narrow. For this reason, we recommend sizing up by at least half a size or going with the next wider fit available, depending on your preference.