Altra Mont Blanc BOA Women's Trail Running Shoes Maroon Bells : Hit the trails at high speeds in the Altra Mont Blanc BOAA(R)! Built for racing, this off-road running shoe helps you run fast during long distance events. Slip into a light and breathable upper with a dual-dial BOAA(R) Fit System for personalized comfort. Every stride on the Altra EGO(TM) Max provides the perfect blend of lightweight comfort, with an extra bounce to push the pace. The VibramA(R) LiteBase outsole uses micro and macro lugs for reliable grip whether you're charging uphill or bombing downhill. For those who go fast, the Altra Mont Blanc BOAA(R) is race-day ready! Who's it for? Competitive trail athletes who need a responsive racer for long distances or ultra marathons. Trail runners who've worn the Altra Lonepeak, Olympus or Superior before and want to try a shoe with a more racing-forward design. Shoe Technology Upper: Lightweight and breathable upper with strategically placed materials to increase airflow in key areas. FootShape(TM) toe box gives your feet more space to sit naturally in the shoe. Dual-dial BOAA(R) Fit System features two distinct adjustment zones for a personalized fit. Midsole: Altra EGO(TM) Max provides a light and luxurious ride with extra bounce and durability for long distances. Balanced Cushioning(TM) platform positions your heel and forefoot at an equal distance from the ground, encouraging better form and low impact landings. Outsole: VibreamA(R) LiteBase outsole offers high-level traction at a reduced weight. Macro and micro lugs provide reliable grip for uphill climbs and downhill descents. Innerflex(TM) grooves add grip and flexibility.