Used in temperatures around 5 deg and this was all I wore under my jacket with its thermal layer in and I was toasty on a recent 150 mile ride. Zerofit base layer. Independently tested, the Move features a 45% polypropylene construction on the inside of the base layer as well as a hollow polyester shell that work in tandem to regulate body temperature, so as users work harder for longer, they don't overheat in the conditions.
