Ideal if you want a technical product combined with comfort. Plus you get the grip you need with natural rubber. 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. Heel Stabilizer. It offers enhanced heel stability, reducing the weight of the material needed for injection to a minimum. Ergonomic design: because you need to keep the perfect position when pedaling and you want comfort too.