Why Choose Merino Wool?


Nature’s Technology

Throughout history, people living in cold regions wore wool fabrics to keep warm. Their old style wool had fibers that were thick, 21 microns or higher, thus irritating the skin. That itchy wool will never be a problem again with the help from Minus33 Merino Wool. All of Minus33’s clothing is made from 17.5 – 18.5 micron fibers, thus creating a super soft, NON-ITCH feel.


The Merino Wool Advantage

At Minus33, we strive to provide you with an all-natural advantage on your outdoor adventures. Merino Wool has so many wonderful properties, which provide you beneficial comfort, safety, and eco-friendly options. We’re convinced that once you give Merino Wool a try, you won’t want to go back to cotton or synthetic layers.



Timeless Natural Insulation

Merino’s history beings with the sheep itself. Merino Sheep live in all types of climates, from freezing mountains to hot plains. Their coats have naturally adapted over time to help them survive in many extreme environments. Wool fibers have a natural crimp, which creates air pockets that trap dead, warm air inside – right next to your skin.


Moisture Wicking and Breathable

Minus33 Merino Wool regulates the amount of moisture on your skin by absorbing any moisture or sweat on your body. Then, the absorbed moisture evaporates out of the fabric into the atmosphere. Wool is a classic natural insulator, but is just as effective in warmer weather due to its rapid moisture wicking ability.


Super Soft and Cozy

Old school wool has a reputation for being itchy. Merino wool, from the Merino breed of sheep, is known for being super soft. Wool’s softness is determined by the micron of the individual fibers. The micron is essentially the diameter of the fiber. The lower the micron, the softer the wool.

Micron Classes
  • Extra Ultrafine: 16.0 and below
  • Ultrafine: 16.1-17.5
  • Superfine: 17.6-18.5
  • Fine: 18.6-19.5
  • Fine Medium: 19.6-20.5
  • Medium: 20.6-22.5
  • Strong: 22.6 and above

Minus33 uses Superfine 18.5 micron Merino Wool for our Midweight and Expedition products, and Ultrafine 17.5 micron for our Lightweight and Micro products. This gauge of wool provides just the right balance of durability and a super soft feel on the skin.


Naturally Flexible and Resilient

Minus33 Merino Wool clothing is naturally elastic, allowing it to stretch to your movements. At the fiber level, wool has a natural crimp which helps it bend to move, and then return to its initial shape. Merino wool does not wrinkle easily for this reason.



Fire Resistant

Merino Wool insulates against high temperatures and does not readily catch fire. If it does, it self-extinguishes. When Merino burns, it doesn’t melt and stick to the skin like synthetic fabrics do. For this reason, merino is popular among military, firefighting, and law enforcement communities.


UV Protection

Don’t worry about sunburn on a sunny day summiting a peak. Lightweight layers have a UPF rating of 25. Midweight and Expedition have a UPF rating of 50+.


Insulates When Wet

Wool will absorb up to 30% of its weight in moisture without feeling wet or clammy. If you do get wet, whether it be from sweat, weather, or water bodies, wool will insulate you better than cotton or polyester materials. This is especially important if you are in a survival situation, and can help prevent or delay hypothermia depending on the conditions.



Renewable, Recyclable, and Biodegradable

Merino Wool has a low environmental footprint and naturally returns to the elements. Shear a merino sheep in the morning, and in the afternoon they’re happily nibbling their way towards renewing next season’s clip. Merino Wool garments are biodegradable and can be composted with minimal waste when the end of their lives are reached, or can easily be recycled to create other wool products.


Odor Resistant & Anti-Microbial

With less moisture comes less odor. Minus33 Merino Wool resists against microbes and odor, so foot fungus and smelly odor will NOT be a problem while wearing our products. Merino Wool fibers naturally reject any bacteria in moisture or sweat as it is wicked away. This means you don’t have to wash wool as often. Less laundry means less water being used, benefiting our planet.