ProTec "Back Country" Ski & Snowboarding Helmet for Sale. Size Medium (55~56cm). Used, but in good condition. Below is info from the manufacture... The ProTec Back Country Helmet is officially certified for ski & snowboarding use. Made with a dense shell to protect your noggin, the Back Country helmet features an impact liner to cushion your dome in a fall, and removable and washable pads. Don't settle for just any helmet, ride in style with the protection you need.