When it comes to maintaining a consistent body temperature and comfort level, there's no quicker way to meeting the objective than with our Engineered Short Sleeve Tech Layer. The science behind it is pretty simple. The base layer is comprised of our VaporRizeª knit fabrics that pull moisture away from the skin and distributes it across a large surface area where it can be rapidly evaporated. So when you think about it, no moisture buildup means that you won't experience any clammy chills as a result of dramatic temperature swings, and your skin, jersey, and jacket are going to remain dry in order to leave you comfortable. And furthering this, the Engineered Tech Layer features a seamless construction that increases comfort by eliminating seam-induced chafing throughout the base layer. This occurs by eliminating points where the materials could possibly bunch, while the design also creates the added benefit of a next-to-skin level of fit that benefits both comfort and moisture wicking. We also furthered this concept by incorporating targeted ventilation zones throughout the base layer, as well as a cycling-specific cut and targeted stretch that creates the proper "push-pull" for the movements of cycling. It's comfort taken to another level.