Traction: 22 ultra durable push-through replaceable carbide spikes for ice-biting, on-demand traction. Lightweight, minimal and supportive for winter running. Durability: The Boa® components are guaranteed for life and the cleat system is backed by Korkers Rock Solid Guarantee. Rest assured, this product is made to last no matter where your next run may take you. Fit: Boa® Fit: Dial in the perfect fit and adjust on the fly when needed. The Boa® L6 Fit system wraps from all angles to create a fluid, form-fit and is designed to work best on low-to-mid volume running shoes. Sizes: See size guide. Weight: 8oz per pair.