Sitka Gear uses a premium 17.5-micron merino wool face backed by a soft polyester interior that provides a highly insulating, breathable, stretchy and naturally odor-resistant bottom for adaptable layering when the mercury drops.
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Merino Wool
Merino has all the insulating and water resistant qualitites of a classic wool as well as being extremely soft and comfortable against the skin.
Sitka products are the best there is.
These things are warm and VERY well made.