The Altra Women's Impulse Running Shoes lightweight guidance goes to work. Altra's lightest guidance shoe to date and combines Innerflex™ and StabiliPod™ technologies to give you flexiblesupport where you need it. Built-In drainage holes provide quick moisture release and superior airflow for Triathlons & hot weather activities. The friction-free, lightweight upper and FootShape™ toe box keep your feet comfortable across long distance runs and multi-sport races. The fully cushioned Zero Drop™ platform encourages a more natural, low-impact foot strike and features a lightweight, responsive A-Bound™/EVA blend. Go fast, stay strong, and run better with the new Impulse.