Ultra thin Long sleeve Thermal Baselayer Underwear Top for Women
It's thin so it's easy to use under other clothing, layers very well, and the nice scoop neck.
Perfectly fitting
It is really soft and thin so it doesn't really look like you are wearing an undershirt, also the wide neckline really suits my dresses and shirts keeping it's use invisible nice and toasty to keep you warm outside without being to hot to use inside the office.