Easy to breathe 3D Japanese Silk Mask ★ One size fits all, but it's a large size that covers the face from the eyes down to the neck. The outer fabric is cotton linen. The inner side that touches the skin is 100% Japanese silk. The ear loop elastic has an adjustable heart-shaped light pink stopper. *Some people may be allergic to silk. *We received a thank you note from a customer who purchased the mask, saying that their skin irritation from wearing masks was cured after switching to a 100% silk mask.