Description of Boreal Crux Climbing Shoes The incredible fit of Boreal's Crux is supportive and bonds the shoe to your foot as if one. Now that's surgically precise performance. Perfect for technical climbs with micro edges. An essential tool for sport climbing and bouldering. Features: Weight: 478 gr. High quality split leather upper Reinforced double velcro closure Integrated padded mesh tongue Rubber reinforcement across the toes No lining Half stiff midsole Boreal FS-Quattro sole Thickness: 4 - 4.6mm IRS heel Split lasted construction