No fiddling required. I love the ergonomics design. this product works great and i love it to death my audio quality on stream is amazing Las tallas nada que ver, se pidió una talla y es como 2 tallas más grandes I usually do practice laps with some music in the background just to relax. For fans, this is the culmination of a 12-year wait and its a no-brainer. Super comfortable & very light. I bought these for my mother-n-law who wears a size 11 and I couldnt even get them on her feet. However, despite how simple it is, the construction is terrible. Its my second day with my new boots.