The much-awaited Amazon Great Republic Day Sale is live from January 13 to January 19, with exclusive discounts and offers.

Stay warm this winter without bulky clothes, thanks to the best thermal shirts, from classic waffle knits to slim-fit thermals with cold-weather technology.

And you can buy the top in a short or tall length without compromising the slub-style fit. If you’re looking for a standard black T-shirt you can buy in bulk and not worry about, this is it.

The henley fit is more casual and is often used for wear outside of base layers. We didn't just pick any old thermal shirt off the shelf—we tested the best of the best like we were gearing up ...