The PYROS is a suction fitted velcro slipper that excells on boulder problems bearing thin smears, dime edges, pockets and other overhanging gifts. The fit is down right sensuous with the communication from rock to skin very clear - constantly providing input about the hold you're on and how to best use it. Asymetric, semi-rounded toe is comfortable but not lacking precision - you'll be able to use all your toes to push off, pull in or to grab at holds as well. Tensioned & sticky "Y" strap rubber top strap has multiple purpose - to focuses power onto the big toe and ball of foot for edging and also as a friction point for toe hooks. Split leather uppers have breathable neoprene stretch panels for glove-like fit, easy in and out and good seal - handy when you boulder in areas with sandy landings. The rubber treatement is a unique variable thickness molded FS Quattro Rubber sole with a perimeter edging platform backed by a half midsole that has a center cutaway for soft foot smearing sensitivity, wrapping around knobs and blobs also enchanched prehensile grabbing power. Included are traditionally applied fore-rand; soft, stretchy and sensitive IRS heel cup with mini-dimples for heel scums and tensioned heel rand. A powerful package for the advanced boulderer and sport climber. Sold in UK sizes (1 down from US).