T-Shirt-sleeved round neck and wind-protection SIXS. Black carbon. T-shirt long sleeve with wind protection is the solution proposed by SIXS for winter clothing. Unlike all the windproof on the market, SIXS has designed a t-shirt that protects from cold, but does not create the greenhouse effect typical of tissues with windstopper. Our technology allows sweat to not be in contact with the skin of the athlete, and this chapter provides more adequate protection of the whole front, the most exposed to cold air. The back of the t-shirt gives way to the classical technology SIXS original carbon underwear that allows you to preserve the skin from sweat. Technical detail: suitable for winter allows you to delay as much as possible the use of wind-stoppers and heavy clothing can be used in other technical garments: characteristic of all the underwear.