Trophy Ear produces the world's first custom electronic hearing protection with a soft silicone shell. This soft material gives you a more comfortable fit than all our competitors acrylic shells. This material also gives you an industry leading 29db NRR as it is more dense than acrylic shells. The 12 frequency bands, independent volume controls, pushbutton tone control with four listening programs, automatic background noise filter, automatic feedback canceller, and P2i waterproof nano coating gives our units the most advanced technology on the market today.