Cooling Bamboo Rayon Pillowcases? Dr Pillow pillow cases are made of bamboo rayon fiber, moisture-wicking, absorbing moisture from your skin doesn't make you feel stuffy? keep you Cooling and Dry All Night, even in hot weather. Temperature Regulating: These bamboo rayon pillowcases have tiny gaps in the fabric, helping to wick-way sweat. pillow cases allow air to circulate through the pillowcase all night long, even in hot weather. Perfect for hot sleepers & night sweats. Good for Your Hair: If you're one of those people with curly, wavy, damaged, or textured hair, you know that battling frizz is real. The smoothness and moisture-retaining effects of rayon made from bamboo pillowcases will help your hair glide over it to reduce tension and pulling at night. Unlike cotton, which tends to absorb some moisture from skin and hair, bamboo rayon fabrics do not absorb the moisture from your hair or skin in this way. Machine Washable : This standard size pillowcase set of 2 measures 20" x 26". Cold Water Machine wash with similar colors , No bleach; Tumble dry low, and cool iron if needed.