Base layers usually function in two ways, first to help with moisture management to keep you dry, and second to minimize abrasion from outer layers such as shorts with bibs. The Gore Bike Wear Base Layer WindStopper Long Sleeve Shirt has a third purpose. Its wind stopping properties keep icy wind from blasting through your jersey to your skin. Areas most prone to being exposed to cold air feature inner panels of Gore's WindStopper membrane the chest, shoulders, and kidneys. The layer on top of the WindStopper is a moisture wicking, polypropylene fabric, blended with elastane and nylon. You'll feel this stretchy, yet form fit layer, hug your curves when you don it. The material wicks moisture away from your skin allowing it to evaporate to keep you dry and warm. The thin and soft fabric has minimal seams and, where necessary, flatlock stitching was used. An extra long back keeps this shirt tucked into your bibs for added comfort while riding.The Gore Bike Wear Base Layer Windstopper Long Sleeve Shirt is available in sizes X Small to XX Large in White and Black.