Sleeping on a satin pillowcase helps your skin stay smooth and your hair stay soft. Satin pillowcases help keep your skin healthy by reducing the appearance of facial wrinkles, fine lines, and dull, dry skin. As for your hair, satin helps retain moisture in the hair from products and natural oils and reduce friction that could cause tangles and breakage. Satin being an extremely soft material causes less friction between the skin or hair and the fabric.