Only issue, if used for to long they can bother your ear, because they sit on the ear not around them. It is worth it! No adhesive whatsoever. Needless to say I was, and am, very impressed with this company. I purchased two cabinets arrived via USP in perfect condition . Its a fun device otherwise! Totalmente satisfecho con el servicio de Amazon. at a time and they are as comfortable as a $60 pair of muffs should ever be. Extremely pleased with the product and quick processing/delivery. It is the only one of the four that has an adjustable heel strap.