Shred Ready TDub Helmet One Size fits most and can be customized using the three different sized fits pads. HOG 3.0 Retention system that utilizes a BOA system to easily dial in the perfect tension Shredlar Armid Fiber/fiberglass composite construction Certified CE 1385 international standard for headgear for whitewater sports Multi-Impact VN foam liner laminated to closed-cell comfort foam