Most damage caused to the ear canal is due to excessive noise and is irreparable which often results in partial or full loss of hearing. Don't take chances. Our collapsible ear muff is fully adjustable for a perfect customized fit. The muff is multi positional, slim and flexible for added comfort. Construction of the ear muff is rugged and durable and able to stand the test of time. The unit folds nicely for easy storage in tool boxes, compartments or in your work station. The NRR rating for this muff is 25.