Sometimes the simplest designs are also the smartest the trinity is an easy fit for riders who want a classic cycling helmet that doesnt compromise comfort or performance it includes key features like in mold construction to keep the weight low and the easy one handed adjustments of our acclaimed acu dial system for a quick sure fit no matter where or how far you ridefeaturesfull coverage shellreflective rear decalconstructionin mold polycarbonate shell with eps linerfit systemroc loc