For me, the Uniqlo Heattech leggings and long-sleeve T-shirt work great solely as thermal layers and not much else. The leggings in particular are incredibly thin, and I've noticed that they're ...

“Uniqlo’s Heattech are the only thermals ... first time and my upperbody never once felt cold. I love that the long sleeve turtleneck is super lightweight (almost sheer) and is so buttery ...