Never has a climbing shoe (or perhaps a shoe of any other kid) fit me so perfectly. I have tried on/tried out over thirty pairs of climbing shoes, and none of them have been perfect in every way, as the La Sportiva Solution has. I have a very wide, acutely arched foot, and a very low volume heel, and often have trouble fitting into aggressive climbing shoes. I have owned and used extensively : La Sportiva Miura Lace-Up in 46 (excellent all around shoe, but became very sloppy over time), the Five Ten Anasazi Verde in 12.5 (excellent edging shoe but horrible, baggy heel), and the La Sportiva Solution (perfect in every way possible). The heel cup, suction-cups to my heel, and the indentation under the ball of my foot perfectly nestles my forefoot into the tip of the shoe for absolute sensitivity and power focus into my toes. Now, for the performance: This thing edges on a dime on slabs and vertical routes (not the best at smearing), heel-hooks and toe-hooks on steep sport routes and boulder problems, and its sensitivity and stickiness has no equal. It is not the best all around shoe, however, for the kind of climbing it was designed for, I feel that it has not equal. I usually wear 12.5/13 in street shoes, and in these I wear an 11/44.5 for a performance fit.