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Size GuideWeighing in at 1500 grams, the new SE4 Polyacrylite Helmet comes with MIPS, incorporating brain rotational protection.This helmet comes with 16 intake ports to channel cool air around and over a rider's head, forcing hot sweaty air out through six rear exhaust ports. The SE4 Polyacryli..

Size GuideWeighing in at 1500 grams, the new SE4 Polyacrylite Helmet comes with MIPS, incorporating brain rotational protection.This helmet comes with 16 intake ports to channel cool air around and over a rider's head, forcing hot sweaty air out through six rear exhaust ports. The SE4 Polyacryli..