This luxurious mattress pad features organic wool on one side, and organic cotton on the other, hand-tufted to an organic cotton cover. Wool makes an excellent sleeping surface as it is breathable, naturally hypoallergenic, and has thermal-regulating properties. Cotton has the ability to absorb about 1/5 its weight without feeling damp, providing a comfortable sleep environment in warm or humid conditions. The Champlain Seasonal Mattress Pad also features elastic straps and is available in 6 sizes.