:-) I tried the K371s 1st, in that I also have the K553 Pros. I was disappointed. Pedí un 38 (suelo usar un 38,5 pero este tipo de zapatos suele quedar más grande) y me quedaba algo pequeño. what you look for is 11 gauge for half rack applications. For the price, these cant be beat! I was worried sweat may interfere with the quality but after usnig them in multiple workouts theyve been totally fine. A SI ES QUE: PIENSO, HAY DE DOS: O ES UN DISPOSITIVO DAÑADO QUE RECONSTRIYERON Y LO VENDIERON COMO NUEVO ( ya que decía nuevo) O ALGUIEN MAS LO USO UN RATO Y COMO LA MICA DE PASTICO ES MAS FACIL DE CONSEGUIR QUE LA DE SAMSUNG DE PAPEL, SOLO LE PEGO UNA NUEVA Y LISTO LO ENVIO. It also acts as an excellent quality bluetooth speaker which packs quite a punch so far as volume is concerned. The cord is also long so my child can move around a bit without snagging the cord. Also, after purchasing these shoes, it took almost a week to break them in.