It's a common cycling experience: One minute you're cruising along with the sun on your back, warm as could be, and the next minute, the sun has retreated behind some clouds, you've climbed a thousand feet or so, and all you can feel are the wind gusts chilling you to the core. The Gore Bike Wear WS Short Sleeve Women's Base Layer's WindStopper fabric will help you push through those hard to predict climate changes. Upon closer inspection, the WindStopper membrane in this base layer covers your front, shoulders, and kidneys. The rest of the layer is made of a polypropyleneelastane blend that wicks sweat away from your body and stretches with you. In terms of warmth, the WS Short Sleeve Women's Base Layer lies between the WS Long Sleeve Women's Base Layer and WS Sleeveless Women's Base Layer. The short sleeve design covers critical heat carrying arteries in your shoulders and upper arms, but gives you more planning flexibility than the long sleeve version. After all, you can pocket arm warmers to use on your ride, if needed. The Gore Bike Wear WS Short Sleeve Women's Base Layer has flatlock seams to reduce abrasion and an extra long back. There's a reflective front logo at the base of the neck, which provides an added glint of visibility if you're riding with your jersey or jacket unzipped. The WS Short Sleeve Women's Base Layer is tight fitting and comes in sizes X Small through XX Large. You can choose Black or White.