Cocoon Premium Hydrophobic Down Pillow Premium hydrophobic down fill resists water, so pillow retains loft, even in wet or humid conditions. Soft, micro-ripstop nylon cover for comfortable, next-to-skin feel. Small: 10 x 13 in., 2.5 oz. Medium: 11 x 15 in., 2.9 oz. Large: 13 x 17 in., 4.4 oz.