The BLUE Vis Viva satin cap is a stylish cap that protects your hair all night and all day. The uniquely designed cap has plenty of room to accommodate all types of hair including bulky hair, locs, braids, hair with rollers, flexi rods and stays on through the night. Wear it to sleep or during the day. Look Good. Feel Good With Vivi satin caps. IMPORTANCE OF SLEEPING WITH VIVI SATIN CAPS: The satin lining helps hair retain moisture and prevents hair damage. It prevents split ends, protects hair from the dryness caused by friction between your hair and moisture-absorbing materials like cotton, greatly reducing breakage, tangles and thinning. Use Vivi Satin caps for strong healthy hair.