This single-track explorer jersey keeps you comfortable and fresh even after a long day on the trail. The GSG short or long sleeve MTB jerseys are made from polyester with an antibacterial finish. You can say goodbye to stale smells for good. The mesh side panels give you greater levels of ventilation when things start to heat up, removing sweat from the body. Worried about chafing? Forget it! The flatlock stitching and seamless underarm panels are smooth and comfortable.