-Worlds #1 Seller for preventing ear pain inflight! -Childrens size will also fit adults with small ears. -CeramX technology protects your middle ear from rapid changes in air pressure -Made with soft, hypoallergenic silicone. RECOMMENDED USE -Insert EarPlanes prior to take-off -Feel free to remove EarPlanes at cruising altitude -Re-insert EarPlanes 45 minutes prior to landing -For best results, replace after 1 round trip Inside every EarPlanes earplug is a small ceramic filter. During take-off and landing of a flight the CeramX filter slows the shift of air pressure that enters your ear. This more gradual change in air pressure exerts less stress on the eardrum, reducing overall ear discomfort.