Description of La Sportiva Venom Climbing Shoe The new La Sportiva Venom does for the slipper what the Testarossa does for lace-ups. This Venom slipper is a triumph of design and construction. The Venom shape comes from the blockbuster Testarossa last, giving it an asymmetrical, down-turned, pocket-seeking toe. The 0.8mm Laspoflex midsole in the forefoot provides a stable platform while retaining maximum sensitivity; sticky XSV on the outsole provides the highest performance rubber available; and a pioneering flexible, breathable, sticky Vibram® Web Rubber upper focuses power to the toe box and provides a sticky surface for toe hooking. All of these innovations relentlessly drive power to the front of the this La Sportiva climbing shoe, allowing never seen before perfomance in a slipper. PD85 last creates the powerful asymmetrical, down-turned, pocket-seeking toe. The Venom's sticky, durable XSV sole, innovative XSV Web Rubber upper, and full XSV heel coverage make this climbing shoe sticky no matter where it hits the rock! The Venom has a web Rubber upper that focuses power to the toe box and provides a sticky surface for toe hooking. Outstanding performance in a La Sportiva slipper climbing shoe. Features: Materials: Upper : Leather/Vibram® Web Rubber Lining : Unlined Sole : 3.5mm Vibram® XSV Midsole : .08mm Laspoflex (forefoot only) Construction: Slip Lasted Last PD85 Weight: 13.5 oz.