Original Yaktrax version. Spikeless/strapless secure grip SkidLock coil system, made of specially treated steel. SkidLock coil system stays snugly with your shoe, offering unhindered ease of movement. Coils are hand-wound in opposite directions to enhance stability. Great for pedestrians, walkers, elderly and kids. Made from injection molded plastic for easy on and off. Made with 1.2mm steel wires with zinc chromate plating to protect against rust. Weight: 1.6-3.3 oz/pair depending on size. Available in 3 colors: Black, Glow-in-the-dark, & Orange. Available in 4 sizes: XS, SM, MD & LG/XL. XS: Men's 1-4.5, Women's 2.5-6 SM: Men's 5-8.5, Women's 6.5-10 MD: Men's 9-11, Women's 10.5-12.5 LG/XL: 11.5 , Women's 13