Moony-chan moony Anti-fall backpack (head guard) Head bump prevention backpack Perfect for practicing sitting and standing up Adjustable straps Size: Total length approx. 29 cm Width approx. 17 cm Weight: approx. 190 g It has a good thickness. I won this through the Moony app. I think it's not for sale. I'm selling it because my son has grown and no longer uses it. He didn't like wearing it, so I only used it a few times, but please judge the condition from the photos.