Outdoorsmen actually used to wear a scratchy wool baselayer intentionally, to stimulate circulation. We're not into that. Paradise is ultrasoft, highly breathable and moves with you just about as easily as another layer of skin. It lives up to its name - 4nothing's softer or performs better against your skin. Of course it's also moisture-wicking, quick-drying and, for the sake of your tent mates, resistant to odors (no offense). The hood offers extra warmth in cool weather. Machine wash. Precision layering. "As silky as it is sporty. This form-fitting baselayer doesn't lose its shape easily. And it really hugs your torso to keep you warm while being long enough to keep performing while you are climbing." - Melissa Arnot