Rossignol Alltrack Pro 100 Ski Boots Men’s all mountain ski boots Size 27.5 (US 9.5) Alltrack Pro boots were designed to ski the whole mountain. The Generative Design Grid Shell engineered for reduced weight and full power transmission in all conditions and terrain. The full custom lining is thermo-moldable for precision fit. Insulated for warmth and support utilizing Thinsulate Stretch. Basically new. Used one time.