Tecnica Women's Valentina TCY Hiking Boot 100% Suede and textile Rubber sole Shaft measures approximately 5" from arch Boot opening measures approximately 9" around TRS (Tecnica Rolling System) is an energy and cushioning system that provides superior forward energy transfer, comfort, and grip resulting in a faster, smoother and safer ride TECNIGRIP outsoles incorporate a rolling spine to provide a consistent grip along with external and center biting lugs for optimal traction and stability Forefoot features a Rolling Rocker that provides better energy transfer and propulsion with every step Anti-microbial, Ortholite footbeds