You can't put on a second layer until you've put on your first. If your first is the Columbia Women's Long Sleeve Layer First Hooded Shirt, it's so comfortable that you just might feel the need to leave it at that. Whether you're up for an early morning run or throwing something on to go grab coffee, you'll appreciate the way the stretch fabric moves with you as you go. An antimicrobial treatment keeps the funk away, even when you're four days into your latest adventure without a washing machine in sight. Speaking of adventuring, the UPF 15 rated fabric will help go a long way to avoiding overheating and sunburns along the way.