DetailsSmartwool Size Chart Smartwool's Women's Merino 250 Jogger Bottom is going to be your new cold-weather favorite. Merino next-to-skin offers plenty of comfort and impressive breathability when it’s time to move. An extra-wide elastic waistband helps keep your joggers comfortably in place. Two pockets keep things convenient and bottom-of-the-leg elastic helps keep drafts away and dials the fit you want. It's all of the comfort you want and everything else you didn't know you needed. So jog on, joggers.