Even though I had to size up, I?m glad I did. Ended up getting Aliphs optional e-shaped Era ones, which fit perfectly, provide far better sound transmission, and hold solidly to my face. I cant comment on arch since Im flat footed. Very comfortable i have to admit but come on 3 days - thats a joke! Construction seems sound. Shes definitely a survivor. I love this charger more than the one that came with my Apple Watch! Twice as much cable. I like how sleek they are, and i LOVE that they have the magnetic ends to help keep them around your neck. Need to stick two cell phones to a window frame? Check.