Reviews overview
This is what other customers say:
One of the warmest and most breathable baselayers I own. I love the mesh on the pits and back that stop you from getting too sweaty while wearing a heavy rucksack.
While hiking up Skiddaw, I wore only this and a thin waterproof, when the winds picked up, in about 2°c. I was plenty warm enough!
The only downside is, it's so breathable you feel every slight breeze.