Designed with the highest grade 6A Mulberry Silk. I. Hypoallergenic - natural resistance to dust mites, fungus, mould and other allergens. II. Regulates temperature - keep your little one cool during summer and warm in the winter. III. Hydrating and doesn’t absorb moisture and natural oils. Main Advantage: Reduces hair loss and baby bald spots forming. It also helps repair bald spots by not pulling on the new hair growth. Cozysilk's silk cot sleeve allows your little one's head to glide smoothly across the silk surface, eliminating baby bald spots and knotty bed hair forming. The silk cot sleeves wraps firmly around the cot mattress and bottom cot sheet with 4 ties. Always make sure both ties are tied in a double bow or knot so they can not come undone while baby is sleeping. There is enough ribbon to make sure it can be tied properly. Size Guide: 13" W x 30" L, with four ties (28" L each), can be adjusted to fit all standard bassinet mattresses and crib mattresses with a circumference from 30" - 76" (75cm - 193cm). For example, your crib mattress is 28" x 52" + 6", then its circumference is 28 + 6 + 28 + 6 = 68". Care Instruction: They are machine washable in cool water on a gentle cycle, using a washing bag. Hand wash is recommended. Cool iron on reverse side.