I can wear them all day with ease! If its antything like this one its going to be approximately a 11. Overall if youre looking for a pedometer and earbud combo this one is worth the money. Where do I even begin. This unit delivers! Im questioning the long term durability of the case due to stretching to much so frequently. Prior years had better color combinations. I used to get bruises doing squats before this. After leaving that company and returning the headset, I turned around and bought one for myself for the next job, even though I had a corded low end system that worked OK. They are easy to step in and out of.