1) Made of 100 % silicone 2) Easy to clean and reusable 3) Allow ear to breathe, as such can be in position for long period 1) Made of 100 % silicone, 2) Easy to clean and reusable, 3) Allow ear to breathe, as such can be in position for long period.4) Useful for: Industry, Air Travel, Military, Trains, Motorbikes, Discotheques, Shooting ranges etc. 5) Useful in all noisy environments and as a ...