This soft, synthetic base layer top from REI Co-op provides midweight warmth for comfortable layering on cold days. The recycled polyester and spandex fabric is peached for a supersoft next-to-skin feel, while a smooth face lets outer layers slide on easily.
Thumbholes hold the sleeves in place and help seal in warmth, underarm gussets allow a full range of movement, and flat seams reduce chafing. The semifitted cut hugs the body for optimum performance.
Fair Trade Certified™ Factory - Contains recycled materials - Contains bluepass certified material - From a Climate Label Certified brand
Highlights
Recycled polyester/spandex is peached for a supersoft next-to-skin layer—and has a smooth face so layers slide on easily
220 g/m² fabric weight offers midweight warmth and wicks moisture to keep you comfortable, with spandex adding just the right amount of stretch
UPF 50+ sun protection
Thumbholes hold sleeves in place and help seal warmth in
Underarm gussets allow full range of movement
Semifitted to hug the body for optimum performance
Flat seams reduce chafing
Locker loop makes it easy to hang this to dry or just keep it off the ground
Machine wash cold; wash separately; gentle cycle; remove promptly; do not use bleach or fabric softeners; tumble dry low; low iron; do not dry clean
Contains bluepass certified material
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
What is the back length?
0 Answers
Is this a new fabric for 2026? I have some midweight REI baselayers from 3-4 years ago and like them a lot. I tried to buy more in 2025 but the fabric had been switched to somethign much ligher weight which didn't meet my needs. Is this heavier fabric?
This top has been made with the same material blend since 2022.
Better gear is built together. 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.
