Finding the fun in winter riding can be challenging, but riding through the winter with wet skin is impossible. That's why Gore Bike Wear created its Functional Thermo Women's Long Sleeve Base Layer. And by pairing a hydrophobic fiber composition with a precise, anatomic fit, Gore has ensured that you'll be riding happily all winter long. Like any base layer, the key function of the Functional Thermo base layer is moisture management. However, where this base layer differs from all the rest is that it actually works. First, though, let's briefly examine why you actually need a base layer. Essentially, your body has a much more difficult time regulating its temperature when your skin is wet. For a little experiment, blow on the back of your hand. Now, wet the back of your hand and blow on it again. Cooler right' Now, imagine that your breath is a 40 degree headwind, and you'll quickly realize just how important dry skin actually is in cold weather. To ensure that this happens, the Thermo base layer fits like a second skin in order to increase moisture management efficiency. The combination of an internal hydrophobic fabric polypropylene with an external hydrophilic fabric elastane pulls moisture away from your body and evaporates it quickly. And as a result, your skin is kept and your temperature remains well regulated. Gore designed the Thermo base layer with as few seams as possible. After all, your skin doesn't have seams, so why should your second skin' Where seams were necessary Gore used flatlock seams, which cause less chafing than the traditional variety, while also creating a closer fit to the body. The Gore Bike Wear Functional Thermo Women's Long Sleeve Base Layer is available in the colors Black and White and in six sizes from X Small to XX Large.