The fabric the eye mask is made of is lovely to wear and very comfortable against the skin. It fits well enough and excludes 85-90% of the light. As I can't tolerate anything tight around my head the mask may slip a little but that can't be helped. However, my mask is somewhat misshapen and appears to have been rather badly cut and sewn. I didn't send it back because it's for me and it doesn't affect the effectiveness but I was a little disappointed.