If the splitter truly doesnt affect sound quality when using it on an output port then it stands to reason that there should be no effect when using it on an input port. I also wore them in Alaska with thick socks and they were great. The mute / volume / power controls are all in good spots and easy to use. But they are not worth bothering over if you have anything other than a very narrow foot, they will not be comfortable, I guarantee. And then reassemble. The popularity of true wireless earbuds has taken off. I decided to order size 7 for these flip flops. The smallest size available was a 9, and it is slightly big but still is not a problem. However, they are very soft, so it is not uncomfortable. Im not sure Siggy wanted to be immortalized in slippers, but hey, if the shoe fits.