I ordered the same size that I had on both previous pairs but on this style they seemed a bit smaller. I thought I would need a bit of a bigger size (but I didnt) so I had to return for a size down. Im still trying to get to know all of this thats why my evaluation of the sound quality is kinda vague but if you listen to anyone who review this headphones its pretty much it straight up like badseed tech and z review said. I estimate 10-15 hour battery life. Therefore, in conclusion, for £120 squid, decent build quality and lovely fit (for my odd shaped head anyways) these are by far the best sounding "straight out the box" bass headphones Ive come across on the market so far. The book did not disappoint in either. Very sad about it, its hard to find shoes that fit my size in the stores but online there are more options. They are so comfortable you hardly feel them at all. Four stars because it could be a little more sturdy and a little longer to fit the height of 5 size 13 jordans a little better Ive spent well over $200 and purchased some of the highest rated (or hyped) options.