In mid-temps, most us gladly ditch the long sleeves. But, to protect your upper body, we recommend wearing a short-sleeved baselayer top under your cycling jersey. This should be made from either a breathable synthetic fabric, merino wool or a refined blended fabric. This kind of top feels nice against your skin and is moisture-wicking to keep you comfortably dry and warm. Two thin layers on your torso are warmer, more breathable and more flexible than a single thick jersey. To increase comfort and prevent chafing, many manufacturers place flat seams on the outside.