bell srt modular street helmet - predator blackout matte/gloss - medium bell the new srt modular combines the quality construction of the srt – fiberglass shell, recessed eps speaker pockets, a broad range of sizing options and class-1 panovision optics – and adds in the versatility and convenience of a modular helmet. all the protection of a quality full helmet when you need it, as well as the ease and accessibility of an open-helmet for when you want to head into the world head-on. srt – putting the sport back in sport touring. dot approved. meets the fmvss 218 standard