Casual shirt for mountain biking breathable and fast-drying stretchy fabric environmentally-friendly manufacturing This casual shirt is a must-have for every mountain biker! The loose fit provides great freedom of movement. It’s made of 100 % recycled polyester for a small carbon footprint. A stylish print and fast-drying fabric are other features you’ll love. The VAUDE Green Shape label stands for environmentally-friendly, functional products made from sustainable materials.