full modular motorcycle helmet TRIANGLE Helmets Face Flip Up Dual Visor for Adults Men and Women DOT Approved : Automotive LS2 Advant X Solid Helmet

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You want lots of ventilation : Compared to other aero helmets, the ventilation is average

Smith Optics Persist 220 Triathlon verdict Solid lid, but pricier and heavier than most here Score: 78% Pros Readily adjustable MIPS protection Visible colour Cons Relatively heavy and pricey The Persist is noticeably heavier and more expensive than others on test, but it does offer more back-of-head coverage and feels durable

(The battery maker, Darfon, is another signficant and growing player in Acers stable)