Durable uppers are waterproof and windproof Features 2.5 mm Polyurethane internal booties Glacier TrekTM SPK outsole technology with 32 replaceable cleats per pair, provide excellent traction on ice and snow Adjustable hook-and-loop strap system for a secure and comfortable fit Lightweight design to help prevent foot and leg fatigue Compact for convenient storage Cleat wrench included with convenient internal pocket to keep wrench handy and available to change cleats on the job.