Bluesign® Approved For Everyday Casual Wear The Feedback Flannel is our versatile, best-selling casual wear button-up, featuring moisture-wicking and breathable materials and a UPF 50+ rating for any outdoor adventure. Constructed with a bluesign® approved 100% polyester fabric, this flannel is wicking, breathable, and UPF 50+. It features two button flap chest pockets, a pen slot at the left chest pocket, and a shirttail hem. The perfect shoulder season layer for quick weekend getaways, clocking in at the office, or linking with friends for happy hour, the Feedback Flannel is year-round essential.