95% Mulberry Silk/ 5% Spandex 101 NIGHT SLEEP TRIAL. Sleep with us for 101 nights. If you are not obsessed, we provide a full refund. Self-Adjusting Memory Foam. Our expertly engineered memory foam is lighter and airier to provide the optimal balance of comfort and support. TriSilk Moisturizing Pillowcase. Our proprietary spandex silk formula supports optimal moisture levels for healthy, beautiful skin and hair. Intelligently Designed Black Hue. Signature black hue negates light acting like a built in sleep mask to promote deeper sleep. Made in USA. 3 Year Warranty. TriSilk Pillowcase is machine washable.