--Unlike every other water shoe Ive had (including Nikis) the inner sole has never slipped. Yo lo uso principalmente para escurchar podcast no soy muy fan de musica, pero hasta ahora no noto la diferencia en calidad de sonido con audifonos tradicionales. no arguments quibbles or issues. Also, the app is not great. A few minor suggestions when putting up into a suitable wood background:- you probably don?t to waste time measuring out with the paper template provided as you can mark through the bike rack itself- you will need to drill pilot holes as the screws provided are chunky and won?t go straight into the wood- the red plastic sections are a little fiddly to get used to as they weren?t clear on the instructions, at least to me. Put it on and went to tighten it and the metal clip piece broke off immediately. Ive legitimately walked in these shoes for a total of 2000 miles around the world. Poor fit. The volume control on the wire is really heavy so it pulls all the wire to my left side. Wenn ich nur einen KH für unterwegs suchen würde, würde ich den NC-25 nehmen.