Amazing light blocking from a wonderful sleep mask; the dreamer is a long time favorite of many dream essentials customers; liked for its style, comfort and ability to block light.the fabric that rests over the eye area on the face is plush, fully breathable, 100% cotton interlock padding. it is a slim-line sleep mask it is super-comfy and when fitted correctly provides typically 100% light blocking for most users.this sleep mask features the comfort snug adjustable head band, which is a wide strap that gently cradles the head in a smooth secure way. available in several different fabric colours and options and washable.