Nylon filled with fiberglass and enriched with carbon powder: the right mix of stiffness, just for you. The micrometric system that guarantees you precision closure. You control how pressure on the instep strap is released step by step, even when racing. It's the Northwave ventilation system with large vents that lets your feet breathe: the lower vent channels air inside the sole, while the side vents guarantee a supply of fresh air. Omega Heel. More ventilation, grip and heel protection even with full power downstrokes. The rigid profile offers stability combined with an ultralight design.