Regardless of whether you're looking to layer-up for winter or summer riding, our Merino Short Sleeve Tech Layer will keep you riding dry and comfortable. The science behind it is pretty simple. The base layer is comprised of a blend of synthetic, hydrophobic VaporRizeâ¢ fibers and Merino wool yarns that are naturally hydrophilic, meaning that they love pulling moisture away from the skin. And when they do this, our blend of fibers 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. This material also comes with the added benefit in that Merino actually insulates quite efficiently when it encounters moisture, so you'll remain consistently and evenly warm in the winter and cool in the summerâregardless of your level of effort. And with a short sleeve design, it opens the door for use with a standard jersey in the summer or arm warmers in the fall or winter. VaporRizeâ¢ Merino wool blend is incredibly soft and naturally wicks away and evaporates moisture, while also targeting and eliminating most odors.Cycling-specific fit and construction complement your movements in the saddle, while also allowing ample room for layering in order to eliminate bulk under the jersey.Soft puff stitching feels as close to seamless as seams can get, virtually eliminating abrasion and chafing throughout the motions of cycling.Form Fit closely & precisely conforms to the curves of the body, ensuring an unrivaled level of fit and comfort.