The STINGMA is made to excel on boulder problems, in competitions and on sport climbs and is equipped with a graded half midsole (stiffer at the edges and softer in the center), raised toe crest and leather footbed for greater "grabbing" power. The STINGMA features an asymmetric, semi-rounded toe that is comfortable and precise - you'll be able to use all your toes to push off, pull in or to grab at holds as well. Trademark tensioned & sticky rubber top strap limits side to side "rand bulge" while focusing power onto the big toe and ball of foot. It also frictions well in cracks and on underclings making toe hooks more secure. Unlined split leather uppers are breathable and speed lace system overlays gusseted foam padded tongue for finite adjustment, comfort and security. The rubber treatment is a unique variable thickness molded FS Quattro Rubber sole, a traditionally applied fore-rand and tensioned heel-rand with stretchy and sensitive dimpled IRS heel cup. A great balance of edge-ability and sensitivity! Sold in UK sizes (subtract 1 - 1 1/2 from your US size).