This mask is extremely comfortable, with wide soft adjustable strap (even fits big heads like mine), and actually blocks light!!! Wow, I couldn't believe it actually blocks light. Most other sleep masks I've tried are made of semi-transparent fabric, and only make it seem dark by cutting off blood circulation to the visual cortex of the brain with a tight elastic, tourniquet-like strap. These guys get around the problem by just using a black, non-transparent material that fits to your face. So innovative!