The nylon chassis is filled with fiberglass and co injected to the outer polished TPU shell. The rubber studs provide excellent grip: you want less weight and more performance so this is exclusively for you. Its 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. EVA and microfiber offer lightness, sole support and the perfect degree of stiffness to transmit all your power to the pedals.