on a ride where the temp won't get over 20 degrees

-Lake MXZ MTB boots with Smartwool hiking weight socks & toe warmers
- Castelli tights, they're a middle weight fabric
- lightweight wicking base layer
- midweight long sleeve jeresey
- Castelli Pendragon winter riding coat
- Pearl Izumi Amfib lobster claw gloves with liner
- Balaclava with light weight skull cap

Thats what I wear on my weekend 3-4 hour mtb rides. If it warms up much (say 25-30) I'll take the jacket off and stow it in my camelbak.