Troll full-body children's climbing harness (Lizard one size).  Maximum 40 kgs.  Very adjustable.  I'd guess suitable for typical children of 7 or 8 to about 15 or 16.  In perfect like-new condition in original bag.  Designed to keep children upright if they take a fall.  Super safe & comfortable.  Suitable for rock climbing, abseiling & via ferrata.