Lighter weight than our standard Thermal Warmer collection, Seamless Knee Warmers are perfect to stash in a jersey pocket when you need a little extra protection on a fast descent or for a long climb in the shadows. - Fabric Content: 58% Polypropylene, 37% Polyamide, 5% Elastane - Thermal yarns feature a brushed fleece interior that insulates, while remaining highly breathable and effective at managing moisture.