Smartwool Classic All-Season Merino Base Layer 1/4 Zip Women's

Some mornings start crisp and end sweaty, and this is exactly the kind of layer that keeps up with that swing. The Women's Classic All-Season Merino Base Layer 1/4 Zip puts 100% merino wool right against your skin, so you get natural temperature regulation whether you're skinning up a ridge or grinding out cold-weather miles on the trail. The quarter-zip neck gives you quick venting when the effort ramps up, and the slim fit follows your body's contours instead of bunching under a shell or midlayer. Merrow stretch stitching flexes through every reach and stride, while princess seams on the front and back panels shape the fit without adding bulk. It layers clean under a shell for backcountry days and works just as well as a standalone piece for brisk trail runs or everyday errands when the temperature can't make up its mind.

Features

• Quarter-zip neckline lets you vent heat quickly when you're working hard
• Merrow stretch stitching moves with your body for better range of motion
• Princess seams on front and back panels shape a flattering, contoured fit
• Merino wool worn next to skin helps regulate temperature and resist odor naturally
• Recycled nylon blended into the fabric supports more sustainable manufacturing
• Slim, body-hugging cut layers cleanly under a shell or midlayer