The sound is actually very good for such an inexpensive earbud. 3. 5 in America, bought a size 38N in the color gray (Metallic Anthracite) and it fits perfectly. If you look at my photo you’ll see my heel is at the very end, almost falling off. It was a huge bonus that when I had a question before buying it. Amazing foot callus remover! These are super cute but not well built. See my pics. They also have great metatarsal arch support which is lacking in many inserts. until I purchased these.