Whether you're out skiing the whole day or just sledging down your favourite hill, you've got to have the perfect first layer to keep you warm and dry. The M NTS MID 250 COLOR BLOCK CREW is the warmest functional T-shirt by Smartwool. Its amazing advantages are all possible thanks to merino that also serves as a natural thermoregulation and a moisture wicking fabric. The T-shirt can be worn as a first layer in cold weather or as a single layer for not so cold days.