Constant training, preparing and studying to deliver top performance when the stakes are highest-Danner FullBore Duty Boots are built to live up to the athletic demands of men and women in service. Forming the core of its DNA is the Vibram SPE (Specialized Performance Elastomer) midsole. With its unique blend of rubber and EVA, the SPE midsole boasts improved durability over standard midsoles, while minimizing weight and enhancing energy inchrebound. inch For you, that means the FullBore delivers the superior comfort and cushioning you need to tackle any objective. To give you the best grip on the widest range of terrain, Danner sought out Vibram's innovative Megagrip compound and paired it with self-adaptive lugs and flex lines to provide top-tier flexibility and rock-solid traction. So you have all the tools you need to improvise, adapt and overcome any obstacle. Water-resistant suede and breathable mesh uppers are ultra-light and airy Vibram Fuga outsoles with Megagrip compound and self-adaptive lugs deliver superior traction on a wide range of wet and dry surfaces VIbram SPE (Specialized Performance Elastomer) midsole provides cushioning and energy return while holding its shape longer than other midsoles Removable Ortholite footbed for support and cushioning Moisture-wicking airmesh lining keeps you cool Nylon shank for underfoot support Each approx. 4.5 inchh., 21 oz.