St Dormeir Wool King Mattress Protector, 16" Pocket St. Dormeir mattress protectors are quilted with 100% Virgin New Zealand Wool, using a special unbleached, undyed 100% cotton quilted terry cover and cotton poly blend base. Why St. Dormeir Wool? Wool absorbs perspiration much better than polyester and will keep your pillow wonderfully clean and fresh. Its breathability keeps you cool in the summer and cozy in the winter, with a wonderfully soft surface. Wool also lasts years longer and is naturally flame retardant. A special European milling process makes this wool completely machine washable. Care instructions: There is wool inside so it must be washed to specific instructions or dry cleaned. Wool is sensitive to heat. Wash only in a front loading washer or top loading washer without an agitator on a high speed, warm or cool water only cycle using an enzyme free detergent such as Woolite Baby. Hang to dry.