THE NORTH FACE. NF0A5GHP2NC. MENS ARROYO LIGHTWEIGHT FLANNEL. TNF BLACK SMALL BOLD SHADOW PLAID. The Arroyo Lightweight Flannel is a classic versatile button-down shirt that plays just as well in the city as it does on the trail. Made with 100 percent organic cotton it features our signature plaid pattern that mirrors the dimensions of the iconic Half Dome.