The Pearl Izumi Thermal Arm Warmer features the ELITE Thermal Fleece for superior warmth, stretch, and recovery.
"More practical than a hat and scarf, and a darned sight cooler, Pearl Izumi's arm warmers are lined with a delightful thermal fleece material. And it's worth mentioning that a fair amount of grey matter has been ploughed into getting the cut bang-on, including designing in a specific fit for the left and right arms."