Add the Torrent storm collar to any riding jacket to create a weather barrier between your collar and helmet. For cold wind and rain, the Torrent is built to fit over the jacket collar and comfortably tuck under the helmet to protect you from the harshest weather you can stand on a motorcycle. Sizing guide: measure the largest possible circumference around your head in centimeters (from your nose around the base of your skull). If your measurement is between sizes, choose the larger size to ensure it is not too snug. S: 56cm, M: 58cm, L: 60cm, XL: 66cm Features Compatible with any Klim jacket for ultimate weather protection Fits over jacket collar, tucks into helmet Schoeller® waterproof durable 4-way stretch Brushed elastic binding for comfort Comfort interior lining Reflective piping for added visibility in bad weather Reflective material logo on rear Top benefits Lightweight packable waterproof shield for harsh weather Schoeller® waterproof durable 4-way stretch Snug but comfortable fit for extended riding