Got these kookaburra eclipse slip-in hockey shin guards in size 'small' for my 11 year old daughter, who much prefers them to her previous more traditional ones. Size small was a good size for her. She has slim legs and is 145cm tall. The length of the shin pads was just right and would not have suited a younger child as they would have been too long. We tried them on in JJB sports first, who stock these in their regular hockey range. Agree with previous reviewer that a size guide would have been useful.