Wool has a reputation for being hot, scratchy and made for colder temps. In actuality, wool bedding is naturally breathable, hypoallergenic and pressure-relieving, meaning the best wool mattress toppers are suitable for a wide variety of sleepers and seasons. Our top pick, the Naturepedic Wooly 3-Inch Organic Wool Mattress Topper, has a plush feel made with GOTS-certified organic wool and offers year-round comfort.