The cost of one of these sleep masks may seem like a considerable initial price to pay, however I have slept with a Masters of Mayfair eye mask every night for two years and now cannot sleep without it! It has worked out about 7p a night and is incredible value for money. I have bought them as presents for several people, who have also reported amazing sleep after using one. I have machine washed mine many times and it is still in perfect working order. Would absolutely recommend.