Difficult to install, every time I had to adjust it with great effort (imagine the process in a 2-3 year old child). There were no clear instructions for installation, we never managed to put it on correctly even when we watched detailed videos on YouTube! This fact makes me believe that there was craftsmanship and deception there! Very poor construction, the child fell and the plastic of his helmet literally went inside the foam, we are lucky that it did not get stuck in his head!!!