The fit is easily adjustable for a wide variety of feet. After I put all my bits in I was surprised at how many I had collected over the years. I dont sweat while wearing them. Thankyou SONY. The cord and battery box are either too long or too short, depending on what you are using it for. Its not probably as good as a $100 light, but for $30 you cant beat it! My second Tayogo product was a 7-hour headset that started draining as soon as it was taken off the charger. There is some drag from the magnet-coil system in the wheels. They are a marvel of function over form. When initially bought in October 2017 worked ok, but just ok, not the loudest or best quality expected more out of a $300 unit.