Ive been looking for a belt that can hold my back firmly as I suffer from back pain since many years ago. Made my 558s feel brand new. I normally wear a size 11 1/2, and ordered the largest size available. I have not tried bleaching as I dont want to use anything more than soap and water so they are now her grungy daycare/play sandals. They literally just forgot to drill the holes [See images]. And honestly, my face has never felt better! I asked the seller to send me the right side and they keep making me try to fit the left piece to the right side when I already tried. I have slight hearing loss in one ear. You can’t even tell it’s on and I didn’t experience any air bubbles! The sound isn’t EXACTLY as good, but pretty darn close overall.