There are lots of affordable helmets which weigh less than SOL in your case, like Steelbird and Vega real light-weight helmets, and offer good protection. First thing is, when you buy a helmet, make sure you wear the helmet for fit, comfort, and overall satisfaction and then purchase a helmet, because if you just go purchase a helmet going by photos and details, you're in for a disappointment.
Remember, riding gear is about what makes you feel comfortable and safe, just one of the two is not a good recipe, have both and you're one happy guy.
Cheers!
VJ






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