Safe material and gentle design: these hair rollers are made of sponge and ABS, with a soft and light design. they are safe and comfortable, and are easy on your hair, making them suitable for women and girls. Curling overnight without heat: the curlers are extremely soft and comfortable to wear during the night, so you won't feel them while you sleep. wake up to naturallooking curls and save time in the morning, while you get a better night's rest. No heat, no harm to hair: curling without heat reduces the risk of hair damage. you won't experience hair loss, split ends, or dry, strawlike hair. foam rollers help keep hair healthy, preserving luster and suppleness. Easy home styling: these sleeping hair rollers are foam sponge and do not require heating. they are safe, reliable, and won't pull your hair, allowing you to style your hair at home several times. 23 practical use scenarios Overnight routine: use these rollers before bed to wake up with readytostyle hair for work, school, or events, without spending time on morning styling. Quick morning styling for busy days: sleep with the rollers and have natural curls ready by sunrise, reducing total prep time. Travel and onthego touchups: lightweight and heat, for maintaining curls while on trips or during busy days when you want simple, damage styling.