All duvets are not created equally. The Natura Classic All Seasons Comforter proves this with features like an unbleached 100% cotton cover and Natura Smart Wool fill. The Natura Classic also sets itself apart by quilting the wool fill to the cover thus eliminating the shifting, clumping and hollow spots that are so prevalent in other duvets. Natura Smart Wool is also naturally hypoallergenic, resistant to dust mites, and has thermal regulating properties to accommodate both hot and cold sleepers.