Yaktrax Pro - Adult 2012 - Medium/Black The Yaktrax Pro is designed to be more durable for the active person Great for postal, construction, safety and highway workers Also, great for runners, hikers, and the more active recreational winter athlete Made with a heavy-duty natural rubber material and 1.4mm stainless steel coils and hand wound to give 360 degrees of traction Comes with a removable performance strap to help keep the Pro in place during use Weight: 5.1-5.5 oz/pair depending on size SM: Men's 5-8.5, Women's 6.5-10 MD: Men's 9-11, Women's 10.5-12.5 LG/XL: Men's 11.5+, Women's 13+ XL: Men's 14+