Best Natural Insulation Materials Hemp insulation is particularly valued for its moisture regulation and resistance to mold and pests. Its fibrous texture allows air to circulate while maintaining effective thermal retention. Sheep’s wool, another popular choice, naturally regulates humidity and provides superior insulation during both hot and cold seasons. Cork, harvested from cork oak trees, is lightweight, fire-resistant, and offers outstanding sound absorption properties. Visit : https://hemspan.com/shop/