In any weather and all conditions, Boyt® Weathermaxx® is the one name for extraordinary comfort in next to the skin base layer. Constructed from certified Australian Merino wool fibers that are 30% finer then our competition. Our extra fine wool feels like silk and is so soft and comfortable, you’ll wear them as pajamas! Merino wool is the only material, man made or natural that regulates body temperature through evaporative cooling. When your core temp raises from exertion, the rate of evaporative cooling increases and moves moisture away from the skin yet still provides superior insulation once you slow down or stop. Boyt’s Weathermaxx® Merino wool is machine washable and highly resistant to body odors common with synthetic base layers. If you’re looking for undergarments to keep warm on long winter hunts our mid-weight line will keep you dry and comfortable.