The Pearl Izumi Men's Elite Thermal Arm Warmers are an absolute essential for cool weather riding. The brand's bestselling arm warmer is now updated with water-shedding Thermal Fleece fabric with PI Dry™ technology for all-weather performance. These arm warmers are sold in pairs and have unisex sizing. They feature PI Dry™ technology which is a hydrophobic treatment used on knit or woven fabrics that makes the fibers repel water without effecting the breathability or the feel of the fabric. Now you can splash through a puddle and the spray will simply run off.