5 Series Helmet. The O'NEAL 5SRS helmet combines exceptional airflow design with eye-catching graphics, delivering a helmet that not only keeps riders cool and comfortable but also stands out from the crowd. Whether you're tearing up the trails or hitting the motocross track, the O'NEAL 5SRS helmet offers just what you need! Polycarbonate / ABS shell construction. Shell weight (size large): 1380 grams (±50). Coolmax® liner- Ultra-plush removable and washable padded liner keeps you cool and dry by wicking away sweat. Adjustable visor design.