The tsg evolution injected bmx helmet featuring our custom low snug fit the evolution helmet is one of the slimmest hardshell designs available it features a tough skate style hardshell construction which securely protects all the useful bits of your noggin the design curves anatomically around the head for a great fit and tailored wearing comfort the injected colour line is manufactured with a less elaborated colouring process allowing us to offer it at a lower price range tsg evolution