These trackpants from Adidas are the kind of running essential you are going to reach for on rest days, too. These trackpants offer all the elements that come in handy across the miles, from a sweat-proof pocket to 360 reflectivities. It has enough stretch for post-run yoga and includes side pockets for your keys. Plus, the design is so classic, you won't feel out of place wearing the pair to get a drink with your evening run group. These reflective pants are perfect for training and post-run lounging.