As far as fit is concerned, I found these to be the best fit for my ears. I dont inderstand how they are such different quality from the ones I had since they are the same brand! Me encantan son súper cómodos y el estilo es genial! The charcoal black ones do not like to link up with the other units. say they make her so fast and proves it by suddenly racing past anyone in the room to witness! Works perfectly, sounds great, is convenient to use, has a small footprint, is automatic, plays 45s too. Doesn?t matter how I sit they conform great and don?t leave position. My iPhone 11 fits nice and snug in the easy to use holder. Good sound for a small device I used dawn dish soap and easily washed the shoes in the sink.