We all have felt the chilling effects of long, off season rides on our extremities. But have you ever really thought about your core Sure, you put on a baselayer and a wind cheating jacket, but are you really staying as warm as you should be For bitterly cold days, when you just have to get out and ride, don the Gore Bike Wear Universal Kidney Warmer to keep your core warm as well as support your lower back. The Kidney Warmer outer layer of Gore's Windstopper fabric keeps any chill that may seep through your jacket away from your skin. In addition, a fleece lining means that it won't chafe against your skin. But keeping you warm isn't its only function. Vertical fishbones have been sewn into the structure, which makes it look similar to a corset. They are designed to support your lower back. This is especially important for long off season rides or even for Radonnees or multi day tours. Because, as we know, even if bike fit is perfect, unless we work on core strength religiously, back pain hits us all once in a while.The Gore Bike Wear Universal Kidney Warmer is available in Sizes Small through XX Large and in the color Black.