Ventilated with 31 inlets and aerodynamic with its removable wind shells, The One is also perfectly designed to hold your sunglasses thanks to the Opti-Dock system. Delivered with interchangeable linings, a removable MTB visor and Bolle LED, The One is the most versatile helmet on the market.Removable Wind Shells. Opti-Dock. Safety LED. Removable Visor. Click-to-Fit System. All Season >Delivered with 1 summer lining and 1 winter lining. Delivered with MTB Visor.