Description and useOtifleks' Flier earplugs contain a unique micro filter which reacts to pressure changes instantly, while protecting your peace and quiet during your flight. Made from a thermoactive material, Flier earplugs promote lasting comfort by softening to the shape of your ear canal using your body heat. Suitable for anyone who suffers from ear pain on take-off and landing.Dosage1. Hold the earplug from its end 2. For a better fit, lift your ear with your opposite hand 3. Place into the ear canal 4. DO NOT insert beyond largest flange WarningsDO NOT insert beyond largest flange. Use for continuous periods lasting no longer than eight (8) hours per twenty four (24) hour period. Keep out of reach of children. Parent or guardian's supervision is advised. Do not store in direct sunlight or within proximity of heat sources. Ensure correctly fitting earplug size is used.