Our highly breathable three-quarter-sleeved bike jersey works for both ends of the thermometer, wicking moisture on climbs and hot days and providing extra coverage on chilly days and descents. Made with Responsible Wool Standard (RWS) wool certified by Control Union (TE-00052557). We blend the RWS wool with 35% recycled polyester for versatility and performance. The purchase of RWS-certified products demonstrates demand for better animal welfare practices and responsible land management in the wool supply chain. Made in a Fair Trade Certified™ factory. The Men's Merino Blend 3/4-Sleeved Bike Jersey is fully backed by our Ironclad Guarantee and you can find it on Patagonia.com. | Patagonia Men's Merino Blend 3/4-Sleeved Mountain Bike Jersey Shirt in Black, Large - Recycled Polyester/Nylon