The best I've found isn't sold as a sleep mask, but a "heat massage" mask with beads in it. I never heat it, I only use it as a sleep mask, the beads provide a

The best I've found isn't sold as a sleep mask, but a "heat massage" mask with beads in it. I never heat it, I only use it as a sleep mask, the beads provide a wonderful, and comfortable, light seal.