Neos Navigator Glacier Trek Spike Overshoes Black M. The outsoles with 16 replaceable cleats per pair provides excellent traction on ice and snow. NOT to be used on hard surfaces. They come with a cleat wrench with a convenient internal pocket. They have an expandable gaiter top that can roll-out to increase boot height to 20 inches. The NEOS Navigator 5 GlacierTREK has a polyester upper and 4 mm polyurethane foam insulation which add comfort and warmth. Specifications for Neos Navigator Glacier Trek Spike Overshoes: Manufacturer: Neos Gender: Unisex Age Group: Adults Color: Black Application: Travel Condition: New Weight: 3.3 lb Water Resistance Level: Waterproof Activity/Occasion: Travel Features of Neos Navigator Glacier Trek Spike Overshoes 840 denier polyester polyester upper fabric with waterproof membrane 4mm polyurethane foam insulation for additional warmth 2.5 mm polyurethane internal bootie 15in height extends to 20in with gaiter GlacierTREK SPK outsole with replaceable Stainless Steel Hardened Spikes Cleat wrench included (located in internal pocket) Duraflex quick-release closure with adjustable hook-and-loop strap system Comfort rating of -29C Fits orthopedic footwear Package Contents: Neos Navigator Glacier Trek Spike Overshoes Neos N5P3G-GRY-MED: Navigator Glacier Trek Spike Overshoes Black