At Reactual I like to feature independent clothing companies in the US.

For maximum warmth without bulk I recommend yak wool sweaters

Qiviut (pronounced “kiv-ee-ute”) is the name for the downy hair of the musk ox. It is the warmest fiber in the world — about eight times as warm as sheep’s wool.

These are the warmest men’s sweaters I’ve found for 2019:

These are the warmest base layers I’ve found for 2019:

These are the warmest wool scarves I’ve found. They are are all made of ultrawarm fibers.

Merino wool shorts only made by a few companies so they are somewhat difficult to find.

These hats are made of qiviut (musk ox wool), yak wool, bison wool, alpaca and merino. They are the warmest I’ve found:

This is a list of men’s clothing that features superfine and ultrafine merino wool:

Silk is a great base layer material. Although it is not as warm as wool or tencel, silk is very soft and barely noticeable under your clothing. You can wear it everyday during the colder months.

These are the warmest wool leggings for women I’ve found:

All of these leggings feature a high percentage of merino wool or silk. Both of these material make for a very soft and breathable legging.

Yak down is a very warm fiber that’s also lightweight and soft. It’s a more affordable alternative to the rare qiviut (musk ox down).