The Navy Seal Spider is built around a technical last to provide a superb sensitive feel making it perfect for rapid movements over a variety of terrain. The uppers are made from AKU’s incredibly breathable Air 8000 fabric which offers 11 times the breathability of normal fabric boots. The lower section of the uppers are protected by a tough By Cast rand which is basically a PU coated split leather. The midsole is the really clever bit about the Navy Seal, it is AKU’s IMS 3D midsole which cradles the foot in a natural position reduce fatigue & stress injuries. The IMS midsole features a layer of EVA cushioning above the midsole & directly in contact with your feet. This EVA layer provides instant comfort & reduces foot movement within the boot. The Navy Seal is a very low profile boot with a Vibram SWOT outsole, & due to this configuration it is not suited for use with a heavy pack or for extended duties. Please note that these boots are in no way waterproof!