I own 4 pr of arm warmers. Voler, Gore, Pearl Izumi, and some no-name nylony things.

The Pearl Izumi fleece arm warmers are my absolute favorites - the fleece is nice and warm and cozy feeling.

The Voler (Amici Veloci) are my next favorite.

The Goretex ones are OK but don't really fit so I've never liked them. The no-name pair is very thin, and not so effective, but I wear them on occaion since I have the matching jersey. Compared with the PI, they are - well - useless.

I will likely be ordering a couple more pair of the Pearl Izumis soon.

http://www.teamestrogen.com/prodPI_14371004.html