The neck is a little bit tight. With a hair clip / hair piled high I am not come through (Ok, you do not have in front of tightening then yes high stuck ... but at other Funtionsshirts I have this problem, because the neck as stretchable is and not quite so tight).
The shirt is well made but.
For thermal power, I can not say anything because my sleeves were already clearly too short and I must therefore return the sleeve.