i would think your boy for the size 5 is too small to fit a small if looking in the youth sizes....but you can buy things in the sz 5 his size...and the sz 10 would be a small/medium in the youth sizes...hope this helps...
answered 8 months ago
SAULT STE MARIE
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Hi! All of our sizes shown are in U.S. measurements. You are welcomed to click on our "customer service" tab and locate "sizing". From here, select the gender you are seeking and a size chart will be shown.As these sizes do change per manufacturer or brand, we recommend referring to your personal measurements before making your final purchase decision.