I called, they listened but no real answers. Moreover, earbuds are so subject to breakage, shorting and loss--especially compared to large headphones, that investing heavily in them is, in many cases, money wasted. Recomended for a good night sleep. Not so great. From the day I got them only one of them worked. The extra padding on the sole Made them so comfortable for her on bare wooden floors. The bottoms are absolutely slip proof. Luckily they werent easily seen once assembled. These are advertised as Memory foam but they?re literally the same material as the original ear pads. I am working from home and use a headset for phone calls.