Comfort is exceptional for the size, and sound reproduction is even and warm. Description says "metallic" and "brass," but these are lightweight plastic without any metal parts. Thank you LGR. Doing the comparison, there is more detail, ambience and instrument accuracy. I got the size 9, I usually wear 9 womens/7. The slippers fit perfectly. A couple of points of advice, if you do get these: 1) they do need some "burn in" time. Essenziale ,di buona fattura , adatto per camminate non impegnative e sulla spiaggia My feet were sore, red, and blistered after wearing them just 6 hours. The beatx lack this annoying cover and I feel that is a benefit.