The meaning of V , GV and GTX in the Asolo style names: V stands for a Vibram outsole, GV stands for Gore-Tex lining with a Vibram outsole, and GTX is for a GORE-TEX® lining.Every trek deserves the Asolo® TPS 535 LTH V EVO.Water-resistant 2.2-2.4 mm full grain leather upper for long-lasting durability. Contains a revolutionary Triple Power Structure (T.P.S.) sole designed by Asolo in partnership with Vibram®.Cambrelle® nylon lining to help keep feet cool.Rubber toe cap.Easy lace-up design that allows for a more preferred fit.Lite 2 footbed has an anatomic construction for excellent underfoot comfort. Dual density PU midsole provides cushioned support.T.P.S. outsole incorporates three shock absorbers that correspond with the areas of foot that receive highest impact during activity thus providing greater shock absorption, comfort and a more dynamic walking solution.Triple Power Structure Evo Asolo/Vibram® rubber outsole features self-cleaning lugs designed for optimum performance on varying types of terrain.Asoflex 00 MR lasting board.