In the idea of a protective foam hat helping prevent bumps and bruises. My wife and I had to take our son to the hospital for stitches on his head a few months ago. You cant catch them all the time and it would be over protective to stick to them like glue and not give them some space to develop. But there are so many hard sufaces now adays so it makes sense to, sometimes, put a cushioning device on their heads. I think this would be a sensible product and could save a trip to accident and emergency, it would cut down on their work load too!
Not So Fast 
In the idea of a protective foam hat helping prevent bumps and bruises. My wife and I had to take our son to the hospital for stitches on his head a few months ago. You cant catch them all the time and it would be over protective to stick to them like glue and not give them some space to develop. But there are so many hard sufaces now adays so it makes sense to, sometimes, put a cushioning device on their heads. I think this would be a sensible product and could save a trip to accident and emergency, it would cut down on their work load too!