Incredible down-turned edging power for steep sport routes and difficult bouldering is what you get in the high performance, brilliantly-designed Testarossa from La Sportiva. Leather and synthetic Lorica upper for bilateral stretch; Lorica is water repellent, breathable, and highly durable. Bilateral stretch technology: strategically placed Lorica (doesn't stretch) and leather (does stretch) in specific patterns. Dynamic (it stretches) synthetic lining in toe and heel. Dry-Best tongue lining transports moisture for dry, cool, comfortable skin. 3D cupped hytrel midsole under the toes ties into a high tension figure-eight rand that allows you to grab features with your feet and go for the chains. Midsole and insole: 3D Hytrel anatomical insert placed under toes. Outsole: 4mm Vibram XS Grip, the hardest and stickiest climbing rubber for edging ability and smearing performance while remaining durable and even wearing. Performance fit with high asymmetry. On sizing, please note climbing shoe sizes are only a suggestion as fit is highly personal. Foot shape, use, and style all play into size selection..