The most advanced entry level shoe on the market. Slight camber and more asymmetric fit than traditional entry level shoes. Creates a more precise connection between climber and hold. Strap version softer than lace up for increased sensitivity. PSR 4. The LV model has 6% lower overall volume than Defy for narrower feet or a snugger, higher performance fit. Key Features Split tongue opening: for easy entry. Single strap closure: for a secure fit. Soft heel construction: for all around comfort. Perforated upper: for breathability Specs Gender: Uni Materials: Upper: Synthetic. Midsole: Full-length 1.6mm plastic midsole Outsole: TRAX® 3.5mm full length Vegan: 100% Midsole: 1.6mm plastic full length Outsole: 3.5mm TRAX SAS Rubber Sizes: 5-14 US MENS (INCLUDING HALF SIZES) 6-15 US WOMENS (INCLUDING HALF SIZES) Upper: SYNTHETIC Volume: 0 (Low Volume) Weight: 215g per shoe