Flannel shirt made from organic cotton Flannel shirt for cooler days made from organic cotton. Our Lumber Check is a slightly brushed flannel fabric and is therefore pleasantly soft and warm. The MaloM. has a boxy cut and the fringed hem gives the checked shirt a unique look. Lumber Check - Lumber Check is a flannel shirt fabric made of 100% cotton, lightly sanded and comfortable to wear on cooler days. Composition: 100% Cotton