This silk sleeping cap is made from pure mulberry silk inside and out. Among the various fibers, silk has the least frictional irritation to human skin, provides comfort and aids hair regeneration. Breathable silk is widely considered to be "human's second skin" and is known as the "queen of fibers". It lights up all night and is as light as a feather. Suitable for long and short hair, thick and fine hair: Size: 43 cm in diameter. We make sizes based on thousands of tests, one size fits most people (durable adjustable elastic drawstrings allow you to adjust the hat to your comfort level). If it feels loose, tie the strap a little tighter. Prevents hair loss and frizz-free hair: retains moisture in hair, does not dry them out, aids in re-growth and does not break while sleeping. Keeps your hairstyle fresh, prevents hair fall and wakes up with no frizz/bedside, just like a silk pillowcase. We did the silky side on the outside to make the nightcap look better. The inside may not be as silky as the outside, but it is also pure silk. You can pull some threads for testing. Flat front design with no marks on forehead: If you have curly hair and sleep with this hat on, you don't need to do anything to your hair except take off the hat; no more tightness with the adjustable straps; no red lines on the forehead, the forehead part uses Flat design; extremely light and easy to carry; your hair can breathe with this silk cap. Care/Packaging/Gift Options: The silk hat is soft but strong enough to withstand frequent washing. Hand or machine wash in cold water on a gentle cycle. Hang to dry. A sweet gift for your wife, mother, girlfriend or just a treat for yourself.