Asolo Avalon GTX Boot - Men's Leather^Suede 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&reg; lining. The summer heat or those cold winter days won't slow you down when you are wearing the protective Asolo&reg; Avalon GTX hiking boot! Hiking boot ideal for summer thru winter walking. One-piece water-resistant 1.8 mm suede leather upper. Traditional lacing system for a preferred fit. GORE-TEX&reg; lining offers excellent moisture wicking and breathability. Lite 2 footbed provides lightweight support and comfort. EVA mono density midsole provides excellent underfoot support and shock absorption. Built with Duo AsoFlex technology to improve comfort and performance. The first element, constructed of a stiff material benefits anti pronation, anti supination and anti torsion. The second element, constructed with a softer material of