Responsibly Sourced. Certified for Confidence.
We choose merino wool with care — sourced from responsible farms and backed by trusted certifications including RWS, Woolmark®, and OEKO-TEX® STANDARD 100. Soft on your skin, thoughtful from the source.
Our heavyweight Merino wool base layer shirt can be worn alone in cool or cold weather or layered as a base layer, designed to help regulate temperature during high-intensity activities. With its exceptional moisture-wicking properties, this Merino wool top keeps you dry all day—perfect for extended outdoor hikes and adventures.
Fabric:
Material: 100% Merino wool from Australia - about merino wool
Fabric Weight: 250gsm
Knit: Interlock Knit
Fiber Diameter: 18.5micron
UPF Rating: 50+
Woolmark® Certified
OEKO-TEX® STANDARD 100 Certified (Class I – Baby Safe)
Responsible Wool Standard® (RWS) Certified
Fit Type: Slim fit design follows the body’s natural curves and moves with you
Layer Type: Base layer, first layers - Learn more
Flatlock Seams: Reduce friction and ensure lasting comfort
Interlock Knit: Dense double-knit construction enhances durability, wind resistance, and warmth
Style #: MT42
Ideal Seasons: Spring, Summer, Fall, and Winter
Activities: Long hikes, travel, camping, biking, running, fishing, hunting, and snow sports.
Wash with like colors
Do not bleach
Do not tumble dry
Line dry in shade
Do not dry clean
Machine wash warm
Learn more
90-Day Warranty - Returns Policy
One-Year Extended Warranty with Registration - Warranty Policy
We choose merino wool with care — sourced from responsible farms and backed by trusted certifications including RWS, Woolmark®, and OEKO-TEX® STANDARD 100. Soft on your skin, thoughtful from the source.