The Iride Seamless Base Layer features Castelli's state-of-the-art seamless knitting technology. This makes the Iride the softest and most comfortable base layer they produce. All you need to do it simply touch the Iride and you'll know it's going to melt on to your body and make you feel like you're wearing cashmere. Beyond comfort, the high-tech texturized polypropylene fibers do an excellent job and wicking moisture and keeping you dry.
Castelli optimizes moisture transport by using a proprietary polyproleyne-Lycra blend fabric. Polypropylene is a proven fabric for quickly transporting moisture away from your skin and keeping you dry . Once the moisture has reached this point, the Iride's Lycra nylon layer then transfers the moisture outward to the surface of the garment to evaporate.