My biceps doing a little more than 35cm (37cm to be exact), I hesitated to buy this product but as it is one of the few that I could find (with fast delivery), and I ordered I am satisfied. The cuff squeezes my arm properly and the scratch seems to hold good. Small flat, my 160GB iPod classic is not perfectly wedged into place and suddenly, the holes to access charging, blocking and headphone jack are not perfectly placed but once trendy headphones, one manipulates more iPod too. The elastic on the side is useless because too small and can be spend only 1 cable of earphones to 2 times maximum. You can spin the "wheel" of the iPod through the plastic to increase or decrease the volume but requires great skill to get there.