Sponge rollers work by manipulating the hair strand into a curl and absorbing moisture from the hair.Flexible plastic frame,easy to use rollers grip the hair without the need for pins and clips.You can use these foam hair rollers when you sleep.Just take a strand of the appropriate hair volume according to the length of your hair and use this flexible hair styling sponge curler, do not add too much hair at one time, otherwise it will affect the effect, its light weight allows you to use it for a long time, and you can wear it anytime and anywhere, even for sleeping use.