Tecnica Mach BOA HV 105 Women's Ski Boots 2025 Size:27.5 26mm Wide polyurethane and a 26mm Wide polyurethane and a 24mm wide core Aerocore™ Construction – Koroyd® material molded into the EPS liner offers incredible energy absorption as well as superior venting The 105 flex is ideal for expert level skiers who spend as much time chasing pow in the trees as carving sweet arcs on corduroy The Tecnica Mach BOA HV 105 W Ski Boots feature a roomy 103mm forefoot but an average volume ankle and the new BOA® Fit System closure on the shell so you can get the perfect level of tightness at any given time (and even adjust it on the lift)