Pure mulberry silk acts as a natural thermoregulator, keeping you cool in summer and warm during winter. The concealed Zipper and Envelope Design keep your pillow in place at night. Shop Now:- https://tafts.com/collections/silk-pillowcases/products/tafts-27-momme-100-pure-mulberry-silk-pillowcase-for-hair-and-skin-both-sides-grade-6a-long-fiber-natural-silk-pillow-case