Giordana Ceramic Base Layers have beneficial effects to circulation and overall well being with their unique Ceramic technology that makes them true all-season garments that can benefit physical performance year round. Made with Resistex® Bioceramic, a nylon/spandex/polyester microfiber material bonded to mineral bio-ceramic crystals. The benefits this delivers are derived from the Far Infrared Rays (FIR), an invisible segment of the light spectrum, that the Bioceramic emits. They reflect the hot rays of the sun creating a genuine barrier against heat in high temperatures. This unique technology helps lower the surface temperature of the fabric, keeping you cool and comfortable. The result is a considerable decrease of calorie consumption and therefore of the body's physical energy. Resistex® Bioceramic also has high heat insulating properties allowing body temperature to remain constant even in extremely cold conditions. Constructed from four panels to contour to the body, the spandex in the mix helps create a form-fitting garment.