Marmot Men's Cliffs Flannel Long Sleeve Shirt 100% Hollow Core Polyester 4.1 oz/yd Imported Quick-Drying and Wicking Soft, Comfortable, Mid-Weight Performance Woven Fabric with Twill Texture Technical Hollowcore Flannel for Durability and Thermal Properties Without the Weight Ultraviolet Protection Factor (UPF) 30 Durable Flat Felled Seams with Contrast Interior Stitch