The SIXS Carbon Merino Underwear® long sleeve st&-up collar jersey with zipper is breathable & thermo-regulating in all conditions. The long sleeves completely wrap around the arms, keep the skin fresh & lie between the skin & overgarment. At the same time, they easily protect against cold draughts when a short sleeve version is worn over the shirt. The contrasting st&-up collar, which can be opened via the practical zipper at the front, also protects the neck from sudden changes in temperature & drafts. Features Seamless technology Antistatic system