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Free Shipping. Boreal Men's Pirana Shoe (Spring 2007) The Pirana Shoe by Boreal is designed for any kind of rock thanks to its great capacity of edging and friction. Exceptional heel for the most demanding boulder problemsSpecifications:2 - 12 u.k. in half-sizes. 465 gr. pair. Size 6 u.k.Boreal FS-QUATTRO. Thickness. 4 - 4.6 mm. depending on size. IRS sole and heel.Features:Premium quality split leather laterally reinforced for better fit and minimal stretch.Integrated padded mesh tongue for comfort.Canvas lined.Half stiff midsole.Slip-lasted.Moderately asymetric and flat soled. Highly versatile performance shoe with no compromise to comfort.