Hi @johnpauh got a printer? Check out this link for the size guide. The Ace 3 is made for children.
Best AnswerI can wear my son's ACE 3 with no problem (male 1.8 m, 80 kg).
Although ACE 3 is designed for kids (although nowhere is written that adults can't use it you can't pair it if you're 13+ year older) you can actually consider to use an Inspire 2 (that is the base of Ace 3) fit with Ace 3 band.
Best Answer