Casca CUBE Helmet Rook Blue Look great and feel great! You're lost in thought about the right shock set-up, tyre pressures and whether you've got enough food and drink on board for the next few hours – so the last thing you want to worry about is a badly fitting helmet. Designed in conjunction with the Natural Fit brand, the ROOK Helmet can be adjusted in the blink of an eye for the perfect fit. It's the ideal choice for everything from long race days to a quick after-work cruise. trail helmet for mountain bikers; shell extends over the back of the head for added protection; 18 large vents; improved ventilation channels; removable visor; SILC 180 Fit System with height and width adjustment can be fine-tuned with one hand for a perfect fit; double-in-mould construction; flat dividers for optimised webbing guiding; X-Lock mounting system; removable, washable pads; other pad thicknesses available; padded ratchet chin closure; Natural Fit concept; matte finish size M (52-57) - L (57-62) material EPS double-in-mould weight 260 g (with visor)