Super Silk 100
Think of the softest piece of clothing you own-chances are you would describe it as "silky soft." Made from the silkworm's natural proteins, silk is the most similar of all fabrics to human skin, which is why it feels so luxuriously soft.
Beyond its softness, silk is also a very high-performance fabric : it can keep you warm in the winter and cool in the summer. Silk is constructed with many unevenly sized fibers that trap air. This trapped air works like insulation to shut out the cold air, keep in the warm. But silk is also cool and breathable-it absorbs 1.5 times more moisture and dries 1.4 times faster than cotton.
Silk is the perfect fabric for underwear worn year-round or for casual activities like walking and light-duty trekking.