Bought 2 at once for my 3 year old and 8 year old. They prefer wearing this to the rental Simba harnesses available at the Gym. Not only because it's theirs, but because they find it more comfy all round. In the Older one's words, "It doesn't dig into the wrong places". More importantly he stumbled on a hold once while being lowered and flipped completely upside down. It was clear that he was never in any danger of slipping out.