Comfortable absorbent, rollers have a soft memory foam core that lets you set, dry and style your hair while you sleep. The rollers are covered with a microfiber material that dries your hair super fast. This means that you can wrap your damp hair at night and wake up with beautiful waves or curls in the morning. Mini rollers are recommended for short or fine hair, and the large rollers work great for long, thick or curly hair. Polyfoam and microfiber. Mini are 3", Large are 6". Roller size available in either Large (8 rollers) or Mini (12 rollers).