Eclipses offer nylon and fiberglass sole technology for a lightweight, technical solution that offers calibrated stiffness and matches your need for comfort. The Northwave ventilation system gives Eclipse unparalleled breathing power with lower vent channels to bring air inside the sole, and side vents for plenty of fresh air to the uppers. Heel stabilization system works with 3-strap velcro closure to ensure a comfortable, snug, adjustable fit...and don"t forget the simple, classique athletic look that complements any setup. Nylon and fiberglass sole provides rigidity and strength for ideal power transfer Upper of synthetic leather and Airmesh keep durability and stiffness while offering plenty of cooling 2 Velcro Strap closure for easy comfort fit Stabilizer heel complements form fitting upper and closure system for ultimate efficiency and fit AirSport footbed combines moisture control and comfort for added comfort and dryness