Base layers aren't just for warmth on cold training rides. The Hincapie Sportswear PowerCore Flex Sleeveless Base Layer strikes a harmonious, temperate balance between your skin and your jersey, no matter the season. Sure, it's absolutely essential to have a lightweight layer of fabric against your skin on frigid mornings to wick away moisture so your thermal layers can insulate without having to mop up cold sweat. But you've also probably seen footage of riders with their jerseys open and unfurled, as they slave up some of the most famous climbs on the hottest July days during the Tour.Even here, the same principles of the base layer apply - proper moisture management prevents your jersey from being overloaded with sweat which impedes your skin's natural ability to regulate temperature. Hincapie's paper-thin PowerCore FlexTek fabric utilizes a recycled polyester stretch fiber weave with hollow 'cores' to deftly wick the moisture from your skin and transport it off the garment. Staying dry is clutch for keeping warm, or keeping cool - depending on whether you're layering with a jersey or a jacket. The fabric's natural quick-drying nature effectively regulates your body temperature; it resists odor, too. The PowerCore Flex Sleeveless Base Layer has an ergonomic, slim fit and an elongated body to tuck comfortably inside your bibs or tights. It is available in sizes Small through XX-Large, and in White only.