Is it good for a 5.4 12 yr old boy and does it break easily?

Nice to receive your question. For a 5.4 12 year old boy, except for the robe, which may be a bit too large, all other accessories are fine. Of course, we have a waist strap that can adjust the length of the robe, and you can freely adjust it to the appropriate length. We have confidence in our products and are not easily break.Wishing you a pleasant shopping experience.