A natural insulator, Wool is an exceptional performer in any cool or cold-weather environment. The comfort and fit is unmatched in performance and the unique characteristics of wool allows the beanie to absorb up to 30 percent of its weight in water without feeling heavy or damp. And to maintain 70 percent of its warmth when wet. The wool fibers also breathe, allowing moisture to be wicked away while its insulating. Wool is also a natural Anti-Microbial.