DRSKIN Thermal Base Layers

Fleece-lined means one thing here and it is worth being precise about it: the inside face of the knit is brushed so that it traps a layer of still air against the skin, while the outside face stays the same smooth polyester as the rest of the range so a trouser or a jacket slides over it instead of catching. That is the whole mechanism. It is warmer than the summer knit by the thickness of that brushed face and by nothing else, and it is still a first layer rather than an outer one.

Nothing on this page carries a temperature rating, because no single garment can carry one honestly. The federal guidance on working in the cold asks for several layers of loose clothing rather than one warm layer, and warns in the same document that clothing which restricts movement is its own hazard — which is a real consideration when the first layer is a compression cut. Read it as the layer that goes on first and let the layers over it do the rest of the work. Sizes run S to 3XL; the packs are two and three; the turtleneck is the one to read twice if you dislike a collar under a jacket.