Very heavy be careful with sizing.
Definitely go a size up so it sits properly on your collar bone and not your lower neck. This is a very heavy collar.  I think I would have less issues with comfort and prolonged  wear if I'd had a larger size.....don't get me wrong it does fit around my neck with plenty of room to fit the o-ring and a hand to grab the ring itself.  I'm having issues with the weight itself which seems to be something like 2lbs and not the 10 oz listed. Which due to the size issue I believe is putting pressure on the arteries on my neck.
Rating: 3 stars