Duvet Inserts are filled with 100% Pure new zealand wool completely sterilized and hypoallergenic making it safe and comfortable for use. 200 GSM fill best for summer/spring season; Wool fibers have thermal properties which adjust to the natural body heat emitted, keeping the chill away in the winter and keeping the body cool in the summer. It has a Baffle box construction which keeps the infill intact and giving you an ideal loft. A combination of wool and organic cotton cover allows this comforter to manage heat and moisture to effectively reduce humidity throughout the night. Double Needle Stitching with Hand Made Grey Satin Piping which enhances the life and Looks of the insert.