The art of winter layering for running is a skill often learned through patterns of mistakes. You’re just as likely to have an uncomfortable time out on the trails if you overdress or underdress, and threading the needle between takes an intuition gleaned from experience. Janji’s Repeat Merino Tech Long Sleeve, the brand’s new cold weather performance staple, is designed to give you a bit more room for error when it comes to dressing for chilly runs. Check out our full review to learn why we think it’s a must-add piece to most runners’ wardrobes.