The Anatomic undershirt is made with the fabric that will best insulate you from the cold on those days: SensodryWarm and it also adapts perfectly to your body and its brushed interior has a very soft touch.
Biotex Hightech Seamless Undershirt
Northwave Long Sleeve Surface Baselayer Undershirt Black
The NORTHWAVE Surface technical short-sleeved undershirt is very light and breathable, perfect for routes in the mid-season period.