Designed for serious cold-weather adventures, the SummitCore Heavyweight Merino Crew Base Layer delivers unmatched warmth and comfort. Crafted from 100% merino wool, this top naturally wicks moisture, resists odors, and dries fast—making it the best merino wool base layer for cold weather.
- Heavyweight 250g merino wool for superior insulation
- Soft, itch-free feel with a close-to-body fit
- UPF 50+ sun protection for high-altitude exposure
- Underarm gussets and rolled shoulder seams for pack-friendly movement
- Locker loop for easy drying and storage
- Made in a Fair Trade Certified™ factory with climate-conscious practices
Whether you’re trekking snowy trails or layering up for alpine climbs, this is the warmest merino wool shirt for winter hiking.
Theresa Wall (verified owner) –
Absolutely love this base layer! It kept me warm during a multi-day hike in sub-zero temps. The fit is perfect and it doesn’t itch at all.
Austin Benson MD (verified owner) –
This is hands down the best merino wool base layer for cold weather. I wore it skiing and never felt cold once. Worth every penny.
Gina Gomez (verified owner) –
I was looking for a heavyweight merino wool top for men on sale and found this gem. Great quality, super soft, and performs well in the cold.