The uppers are made with tough fabric and an abrasion-resistant Honey-Comb Guard in those areas most subject to abrasion. The particularly lightweight boot features as few seams as possible. A 7mm high-density insole makes the shoe very stable and stiff, the EVA/TPU cushioning provide optimal comfort when walking.The Vibram outsole with the exclusive La Sportiva Cube Design provide optimal traction on all surfaces. A GORE-TEX Performance Comfort membrane makes the boot water resistant and breathable. Sweat will be wicked always efficiently! The 3D-Flex System allows for better control and will keep your foot in place. The differentiated lacing system between the upper and the lower part of the boot allows for precise adjustments for a secure fit. Thanks to the crampon-compatible heel, the La Sportiva Trango Tower GTX can be used with the strap-on crampon.GORE-TEX waterproof technologyWater-repellent nylon upper with Honey-Comb Guard and FlexTec 3Vibram Cube Sole - With Impact Brake System lugs on the heel and climbing-zoneNylon 7mm Midsole with wider torsion resistant areas at the rearRubber randTraditional LacingSemi-rigidBoot Grade B2 - Compatible with C2 CramponsWeight Per Pair: 1400g (Size 42)