5 for mules, and size 9 for boots. I been riding my bike on the trails around my house and listening to my music. I have a 2016 Prius C that this bag was used on. The material is 2 mm thick, so does not add additional bulk. The high end of female voices sounds great. Greatly improved sound and reduces potential for them to fall out of my ears. I wear them with socks, but they are not quit secure enough. Excelente producto, debo decir primero que nada que soy comprador asiduo de Turtle Beach desde hace 3 años, empece con el XO Three, hice upgrade al siguiente año al Stealth 600 Gen 1 y en noviembre hice el último upgrade al Stealth 700 Gen 2 y no me arrepiento. Speaker also emits crackling noise intermittently. How they can failed in processing? is it fake one? This is not nike quality.