ISI approved helmet. Scratch resistant helmet and visor. The chin strap comes with an easy to use lock mechanism and ensures that the helmet stays securely in place during the time of an accident. ISI approved Helmet. New helmets may feel tight at first. This is normal and required to ensure safety. Foam requires around 10 days to adjust to rider's head shape. Ridge DX Open Face Bike Motorcycle Helmet- Black. The chin strap comes with an easy to use lock mechanism and ensures that the helmet stays securely in place during the time of an accident.