Also remember that it wont work right out of the box, you have to reset the usb receiver first and hold down on the G button on your headphones for 15 seconds and then it will pair. The arch actually feels natural to me even though I typically wear flat shoes or shoes with a less dramatic arch. Imagine there were tiny skis on the bottom of the boots, but they go horizontal instead of vertically. However, my bust and waist measurements are 41" and 34", so I thought Id play it safe and get the XXL. However they wear them all the time indoors and to run outside quickly. I don?t understand why plum costs more than black? I was unsure about these as entirely black trainers, but they look great. I dont wear it one more Gorgeous looking flip flops . Thats a big plus because when I turn my head sideways my old set would fall out.