Castelli Nanoflex.
http://www.realcyclist.com/castelli-...ex-knee-warmer
Link is for knee warmers, but leg and arm are also available.
DH has these. Loves 'em.
A vid review from Competitive Cyclist (if my iPod cutting and pasting works):
http://www.youtube.com/watch?v=uAzmy...e_gdata_player