You can wear it as a midlayer, outer layer, overlayer, underlayer, or however you can imagine. The MT500 Thermal L/S has always been an essential part of winter wardrobes for MTB riders, and this new version adds a well-fitting hood to its predecessor. The windproof panels are strategically placed at the most stressed areas to keep your muscles warm and ready for action in all conditions. The windproof material used is also very durable and will repeatedly face obstacles on the trail. We are so confident in this product that we offer a hassle-free refund or replacement within 90 days of purchase if you are not satisfied.