Rick Graves owns Clutch Couriers messenger service in Santa Cruz. I ran into Rick Friday night in Santa Cruz sporting a leather hairnet helmet.
He's as aware as you and I that these old style leather hairnets offer little to no protection, but I think they look pretty cool.
Racing cyclists began using padded leather strips to protect their noggins around the turn of the century (the last century, not this one!). With the advent of standards, helmets now provide some impact protection.
Leather hairnets show up every now and again on eBay and Craigslist, generally for somewhere around $100, or you can get a replica for about twenty bucks from La Bicicletta. I'll repeat the CYA warning from La Bicletta's website that the leather hairnet "is not safety certified and as such should not be used while riding your bicycle. La Bicicletta cannot be held liable for any injury related to the misuse of this product."
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little while ago (1.5-2 years) I remember seeing a company in Denver that was making hand stiched hairnets. They also cost as much. Sorry, I cannot find the link now.