REI Co-op Merino 250 Half-Zip Base Layer Top - Men's

This heavyweight merino wool base layer top is made with 100% merino wool for a supersoft feel without the scratchiness. It naturally wicks away sweat, resists odors and dries quickly, with a half-zip collar for ventilation and thumbhole cuffs that hold sleeves in place.

Designed for a close-to-body fit with underarm gussets for ease of movement and forward-rolled shoulder seams to help prevent chafing under pack straps. Machine wash cold with wool wash product, do not bleach, and tumble dry low.

Key Features

Highlights

• Heavyweight 250 g/m² merino wool offers a soft feel without the scratchiness
• Made with 100% merino wool that naturally wicks away sweat, resists odors and dries quickly
• UPF 50+ sun protection
• Collar with half-zip neck lets you ventilate as needed
• Thumbhole cuffs hold sleeves in place and help seal warmth in
• Underarm gussets are made for ease of movement
• Shoulder seams are rolled forward to help prevent chafing under pack straps
• Close-to-body fit for optimum performance
• Back length: 28.5 in.; Tall sizes: 30.5 in.
• Weight for size M: 10.9 oz. (310 g)
• Locker loop makes it easy to hang this shirt to dry or just keep it off the ground
• Machine wash cold, use wool wash product, do not twist or wring, remove promptly; do not bleach; tumble dry low
• Made in a Fair Trade Certified™ factory
• REI Co-op brand is certified to The Climate Label; we actively fund efforts to reduce carbon emissions across our business and support climate projects around the world

How to use

Which material is best?

• Wool: highly moisture-wicking and odor-resistant
• Synthetic: durable and less expensive
• Silk: soft and lightweight for casual activities

Match the temp to the trek

• Lightweight layers: best for moderate to cool temperatures
• Midweight layers: best for cold temperatures
• Heavyweight layers: best for below-freezing temperatures

Find your fit

• Must be close to skin to efficiently wick sweat; should fit comfortably snug
• Base layer is for moisture control; your mid layer is for warmth

From feedback to field testing, all of our gear is dialed-in by REI Co-op members. Their adventures informed every stitch and detail—making for better, longer-lasting gear.

No questions have been asked about this product.

Be the first to ask a question about this product