Description of Boreal Mutant Climbing Shoes The new last provides maximum precision and the perfect balance between sensitivity and fit. Perfect for extreme climbing and bouldering, indoors and outside. Excels on overhanging walls. Features: Weight: 460 gr. High quality split leather upper Elasticed footwrap system Additional velcro closure provides the perfect fit No lining Half midsole with anatomic cutaway Boreal FS-Quattro Thickness: 4 - 4.6mm IRS sole and heel Slip-lasted construction