I made this at home for my child to use. The shoulder straps cross in the back to prevent them from slipping off. To put it on, you simply put the top part of the crossed straps over your head and through your arms, and then fasten the Velcro in the back, making it easy to put on and take off. My child used this when they were in lower elementary school. It's beige, so it's not very noticeable, but there are a few small stains around the stomach area. Approximately 73cm from the shoulder straps to the hem. Approximately 36cm wide.