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I just use my brain and assume that the plastic 'candy' shell on the helmet doesn't do anything (other than moisture protection) and as long as the styrofoam in

I just use my brain and assume that the plastic 'candy' shell on the helmet doesn't do anything (other than moisture protection) and as long as the styrofoam innards are in-tact, then nothing materially changes. Otherwise we'd also see warnings against stickers and artwork on the shell of helmets, but we don't. Or at least I didn't, but I don't really read manuals.

minitoar 4y ago
Every motorcycle helmet manual I’ve read explicitly says not to put stickers on the helmet. Protecting the foam from moisture is important — a rainy ride can significantly weaken the foam. Eg: https://www.bellhelmets.com/on/demandware.static/-/Sites-bellhelmets-Library/default/dw840d32d4/manuals/Bell-Helmets-Motorcycle-Helmet-Instruction-Manual-PS100856-INT.pdf https://www.bellhelmets.com/on/demandware.static/-/Sites-bel...