These High Wire Hemp Jeans are from Patagonia. They're made from a blend of PCR (post-consumer recycled) polyester and exceedingly soft, breathable, resilient hemp. It's a supple fabric that drapes well and is quick to dry. There's more information here. The jeans are available from Altrec, REI, and other outdoor clothing stores for around $68. There's also a women's version available.