Soft Material: The flexible foam sponge hair curlers are made of high-resilience spone. High-resilience sponge stick is soft ,comfortable, breathable, odorless, washable. The curler can be fastened tightly and bent. No matter how you twist or squezee it, it will return to the original shape. Heatless & NO DamageHeatless curling is a new way of coiffuring your hair that prevents heat from damaging your hair and scalp, and no damage to your hair. It works without any electricity, safe and reliable. So you can easily style your hair without any damage to your hair. Give you beautiful and healthy curls. Leightweight & Comfortable: 20pcs hair rollers are perfect for middlelength,long hair, thick hair and thin hair. The light-weight material allow you use it whole night, and you won't feel a headache or feel heavy. Easy to use & Remove:The curlers are easy to use and remove. The spones are soft, so they won't cling to your hair, nor they tangle your hair. Usage stepsUse a comb to separate a small bunch of slightly longer hair before going to bed, wrap it on a curling rod, and fix it tightly one by one. You'll have beautiful curls the next morning. You can sleep comfortably with this heat-free curling iron headband.