Fabric Weights - Minus33® Merino Wool Clothing


At Minus33, we offer three distinct fabric weights for all-season adventures. Which one you choose will depend on a few factors: how active you are, what the weather/temperature is doing, how easily your body gets cold/warm, and the other layers you plan to wear. Use this chart below as a reference, but always keep in mind the changing environment. Low activity is considered little to no physical movement, such as treestand hunting, while high activity is considered constant movement, such as running or hiking.

Temperature recommendations (°F) vs. Activity Level

  • Lightweight

    • seasonal-icon-summer-30px-01   seasonal-icon-spring-30px   seasonal-icon-fall-30px   seasonal-icon-winter-30px
    • 170 g/m2 Jersey Knit
    • 17.5 Micron Merino Wool
    • UPF Rating 25

Merino Wool is no longer reserved for Winter. Minus33’s Lightweight clothing is designed to be worn year round as a base layer or as a solo piece in the spring and summer.


Our incredibly soft Merino Wool provides great temperature regulation with its natural moisture wicking technology. Merino Wool is naturally odor resistant and our machine washable/dryable easy care instructions make cleaning a breeze.


Whether you’re hiking the mountains in the spring or rock climbing in the summer, our Lightweight product should never leave your back. Our Lightweight items are always the first layer on and the last layer off.

  • Midweight

    • seasonal-icon-spring-30px   seasonal-icon-fall-30px   seasonal-icon-winter-30px
    • 230 g/m2 Interlock Knit
    • 18.5 Micron Merino Wool
    • UPF Rating 50+

Versatile and comfortable, our Merino Wool will always have your back. Designed as a three-season garment, our Mid-weight works great as either a base or mid layer.


Our Midweight styles have all the same natural qualities as our Lightweight Merino Wool, with greater insulation. Minus33 Merino Wool Clothing is perfect as a base layer for a day on the slopes or as an emergency pullover when a cold front rolls in just before you summit.

  • Expedition Weight

    • seasonal-icon-winter-30px
    • 400 g/m2 Interlock Knit
    • 18.5 Micron Merino Wool
    • UPF Rating 50+

On the coldest, darkest nights, you will discover yourself seeking the warmth of Minus33 Merino Wool. Our Expedition products are suitable for the coldest climates and true expeditions.

Originally designed for winter mountaineering on Mount Washington, Minus33 Expedition Weight clothing has seen action in both the Antarctic and Arctic, and even to the Summit of Mount Everest.

Anyone venturing out in the cold will greet our Expedition clothing with a warm welcome as either a base, mid or outer layer. When you need to keep the ever-present cold from seeping in, our Expedition items will be your best friend.


Proper layering of your garments is very important and in extreme cases may save your life. Consider your activities carefully and plan for the unexpected.

There are many layering systems that are used, and you may need to experiment to figure out what is right for you. Typically, most people use a 3-4 layer system consisting of a base layer, a mid layer, an insulating layer, and an outer shell layer. Simply add or subtract layers as the environment changes.

Layering Starting Points


Base Layer + Outer Layer


Base Layer + Mid Layer + Outer Layer


Base Layer + Mid Layer + Insulating Layer + Outer Layer

Minus33 Merino Wool How to Layer Base Layer Mid Layer Insulating Layer Outer Shell Layer

Think of your Base Layer as your second skin. These are your first layers on and your last layers off.

  • Thermal
  • Moisture-Wicking
  • Breathable
  • The Foundation Layer

Minus33 Suggested Base Layers

Algonquin Lightweight T-Shirt
Chocorua Men's Midweight Crew
Appalachia Women's Lightweight T-Shirt
Ossipee Women's Midweight Crew

The Mid Layer is your second layer.

  • Insulation
  • Breathable
  • Can be an outer layer if weather permits

Minus33 Suggested Mid Layers

Rogers Midweight Mock Neck
Chocorua Men's Midweight Crew
Sequoia Women's Midweight 1/4 Zip
Ossipee Women's Midweight Crew

The Insulating Layer is used when the weather leans more towards the cold side.

  • A Second Mid Layer
  • Provides Extra Warmth
  • Breathable

Minus33 Suggested Insulating Layers

Kodiak Expedition Full Zip Hoody
Sequoia Women's Midweight 1/4 Zip
Denali Expedition Full Zip

Your last level of defense against the elements of nature.

  • Wind Resistant
  • Water Resistant
  • Packable
  • Breathable

Minus33 Suggested Outer Shell Layers

Thermerino Men's Midweight Hooded Jacket