The standard by which all “heavyweight” baselayers are measured, the Smartwool Merino 250 Baselayer Women's Crew is a longstanding fan favorite which has been updated for an enhanced fit and functionality with the addition of shoulder panels to make these more pack friendly for backcountry skiers and cold weather hikers. Flatlock seaming eliminates chafing while the back body seams wrap to the front of the body for an improved fit that tucks nicely into bibs or winter ski pants. This is one of the most versatile and cozy baselayers on the market.. but you can kick that versatility up several notches depending on how you decide to size this. If you are between sizes.. go up. Go up because putting a lighter featherweight baselayer under this in cold weather extends the comfort range so substantially you’ll wonder why nobody told you about this before. Think of this as a “light sweater” that can be used on its own as a shirt, as a cozy baselayer under a midlayer, and as a “second midlayer” under a thin base. You can thank a visit to Svalbard for this hot tip. Pair this with a wool neckgaiter, and you’ll never look back.