Recommended for Backcountry Hiking, Glacier Travel, Trail Running, and Winter Hiking * Spike made from high-strength 420J2 stainless steel. Harness made out of elastomor * Easy-on, easy-off. Velcro strap * Compressive Strength: 19,898N. Tensile Strength: 1,204N. Rockwall Hardness: 46 HRC * SIZING: X-Small - Womens US 5-7. Small - Womens US 7-9, Mens US 6-8. Medium - Womens US 9-11, Mens US 8-10. Large - Mens US 10-12. X-Large - Mens US 12-15. Weight: 370g (XS); 390g (S); 404g (M); 428 (L); 462 (XL)