Untreated, chemical-free, organic wool filling is naturally resistant to dust mites, molds, mildews and odors, and provides the ultimate in sleeping comfort. Virgin wool is derived from free-range organically raised North American sheep and is washed without harsh chemicals and is free from all moth-proofing or other treatments. Certified organic cotton percale fabric, keeps wool on the inside. Undyed, untreated, natural off-white color. Queen heavy fill is the only size remaining.