I wash my Isotoner slippers in a lingerie bag on delicate cycle and each pair of Isotoner slippers that I have bought over the years always last over a year. 5mm right-angle to straight jack to jack lead for wired audio connection if the charge runs out. While searching on amazon, I saw these, took a chance and purchased them and I am glad I did! It doesnt affect the use at all, and its pretty much unnoticeable. Very nice beads ???? En cuanto al emparejamiento NFC no puedo opinar porque no lo he probado. The worst you should expect that it might be too big not 2 sizes too small! I purchased this for my work & for the price. And yes I have wet them to shorten the break in period. But if not then just order your size based on the size chart.