D.O.T. DAYTONA SKULL CAP- W/BUTTERFLY Meets And Exceeds D.O.T. Safety Standards FMVSS 218. With 3 Different Shell Sizes, You're Sure To Get That Proportionate Fit!! Moisture Wicking Fabric Keeps Your Head Cooler And More Comfortable. Nylon Y-Strap Retention System With Sliding Adjuster. Quick Release Lock With One Finger Release Lever For Easy Detachment.