5%Spandex/95%Viscose Fabric – feels soft, stretchable and comfortable. It’s cooler and more breathable than cotton headcovers in hot weather. ELASTIC BAND under BACK SKULL – the elastic band design provides a secure fit for most; not loose or snug, just gently secured. One size fits for 55-60cm 21.6-23.6. SOFT & BREATHABLE FABRIC – next to sensitive scalps it is entirely comfortable and won’t be itchy, perfect as sleeping or daily cap for chemotherapy / hair-loss patient and the bad hair days headwear, or to wear over a wig. VERSATILE – warm and soft enough for fall and winter, cool and breathable enough for spring and summer. Also great for indoor exercise like barre, pilates, and yoga. The back ruffle could hide the neck and hair, looks more dressy and feminine than average scarf. WASHING INSTRUCTION – Hand wash with cold water; or spot clean; or machine washing on delicate cycle and then air dry.