Joined: Jul 2002
Posts: 40,863
Likes: 3,116
From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
I have a silk longsleeve baselayer. It's gossamer thin, machine washable, and only $20 on sierratradingpost.com or campmor.com (I can't remember; do a google search). I'm going to get a few more this year. Really good under a jersey or wool sweater down to the 40's.
Also a smartwool merino from REI. A bit thicker and good down to the 30s.