Headsweats or try Walmart. They have cotton and polyester do-rags that tie behind the head and have a neck protector for $2.00 each. I have three of them that have lasted me about four years now. Since I bought mine a while back, they might be $2.50 ea.
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HCFR Cycling Team
Ride Safe ... Ride Hard ... Ride Daily
2017 Colnago C-RS
2012 Colnago Ace
2010 Giant Cypress