For Solo2, a 2005 will be good until the 2020s come out. You will probably replace it before that for other reasons.
4.3.1
Helmets meeting the following standards must be worn while on
course: All helmets meeting the current or two immediately
preceding Snell Foundation standards (SA, K, or M), or SFI
standards 31.1A, 31.2A, 41.1A, or 41.2A are acceptable.
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I am a Commodore PET --- Now get off my lawn you kids...
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