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.The Asolo® Shiraz GV MM has the right combination of durability, water-resistance, comfort, and traction that makes it ideal for backpacking, trekking on technical terrains, and long-distance hiking. Tough 1.6-1.8mm water-resistant Schoeller K-Tech and suede upper offers exceptional durability. Mid-cut design provides superior ankle protection.Full rubber rand guards against rocks and other trail debris. GORE-TEX® Performance Comfort Footwear technology offers waterproof protection to ensure feet stay dry and comfortably cool for a wide range of conditions and outdoor activities.Built on the Asoflex 00 MR last. Plush tongue and collar for added comfort and performance. Heel pull loop for easier on and off.Lite 2 insole offers lightweight support and comfort. Dual-density microporous midsole with a PU Anti-Shock insert provide superior support and shock absorption. Vibram® Ascent rubber outsole provides all-day support and comfort with superb traction on a variety of surfaces.