One trick many riders use in Southern CA is the Ice Sock. Pretty simple, it's a long sock (knee length works best). Fill it with ice cubes and leave enough sock at the end to tie it off.

Wrap it around the back of your neck and the weight of the ice usually keeps it in place but yes, you do get drops of cool water dripping on you as it melts (which feels really good too!).

I was first introduced to the Ice Sock concept at the Davis Double Century many years ago (2003) when temps were well over 100 Deg.F. I saw it again last Saturday as I was working support for the Joshua Tree Double Century and many riders were using Ice Socks!

Rick / OCRR