About this item CUSTOM MOLDED EARPLUGS: Easily and quickly fitted to the exact shape of your ear. This creates a perfect fitting earplug that will never hurt, never fall out and provide superior noise isolation. EASY SHAPE SYSTEM: Simply heat the thermoplastic molds in boiling water, let them cool for a bit, and shape them to your ears. That's it, and If you don't get the perfect fit the first time are the only custom earplugs that are re-moldable. Three-layer sound insulation: ear plug head, a layer of sponge sound absorption; thermoplastic mold, two-layer thermoplastic sound insulation; soundproof cover, three-layer high-density silicone sound insulation. Provide high quality effects for enjoy a quiet time. CUSTOM COMFORT: Custom Molded Earplugs are easily and quickly shaped by the user to the exact shape of their ears creating a noise isolating earplugs that is secure and comfortable. Custom Molded Earplugs are re-moldable. Application: It is perfect for shooting, traveling, working, sleeping ,loud concerts, and safety.