Capezio Spun Silver Lamb's Wool 100% Wool Lamb Wool is treated with SmartSilver which is a natural antimicrobial that guards against odor When comes in contact with moisture, release of low levels of silver ions that prevents the growth of microbeads that cuase odor and material degradation 1 oz. tub non-toxic and hypoallergenic 100% Wool SmartSilver is made in the USA