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best full face helmet for a naked bike NENKI Motorcycle Men Women Fiberglass Street Riding Racing Helmet Dual Visor Inner Sun Shield DOT Approved Adult Helmet Red Visor (Orange, Large) : Automotive Laptop Backpack Herschel Original YGroup_nouvelle Line Wright:7/8

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A flap folds over the top and snaps shut, there's one external zippered pocket in the back, and the buckled straps are adjustable

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Maybe an epoxy or something you guys use that is compatible with various substrates