Hot/cold Gel Eye Mask soothes your tired eyes. Slide the reversible mask over your eyes--one side features ultra-soft NapSoft material for warmth and comfort, the other side is made of satin for a gentle, cool sensation. The gel pack inside can be cooled in the freezer or heated in warm water for further comfort and therapy. Eye mask effectively blocks out light, helping you sleep more comfortably. Elastic headband adjusts to your head. One touch and you'll see. The minute your skin comes in contact with the Brookstone Gel Eye Mask, you begin to feel its therapeutic effects. The plush mask instantly envelops you in soothing softness, resulting in a warm, relaxing sensation that seems to permeate through your entire body. The proven way to recharge your day. Recent clinical research has shown that a 15-20 minute nap can enhance alertness, improve focus and give you the energy you need to maintain peak performance throughout the day. What's more, it's also been shown that napping does not have a negative impact on your ability to sleep at night. NOTE: This mask contains 80-84 ml of pressure-relieving gel and conforms to TSA Under-3-Ounce rule.