Grades:

New - issued, unused, most without packaging

Like New - mint, only worn couple of times

Supergrade - very good condition, hardly used, may have very small dusty stains around

Grade 1 - show some wear, may have stains, but no damage, still very good to wear 

                Grade 2+ - show some wear, will be having one small defect, like missing laces, tiny hole, tiny rip or just more stains around

Grade 2 - stained, some may have holes, some will have a larger rips