7. It should be lightweight & comfortable to wear all day.
Look for a knee brace which ticks all of the above but at no cost to weight or wear-ability. You want to be mobile and feel like you are not weighted down or restricted for movement especially those of you looking for preventative or sports supports to aid during exercise.
The knee brace should weigh no more than 200g and be of a low profile design so it can be worn during sport or for long periods under clothes, anything bigger and bulkier will again end up not being used which defeats the purpose of the knee brace in the first place.
Comfort is a factor which will be as important to basic support, in chronic scenarios where knee braces need to be worn constantly this will be a key factor to how well the brace performs and relieves knee pain