Review on Bodtek Boys Thermal Underwear Set Outdoor Recreation by Joe Kokenge

I like this item but the seller should clearly state what is small, medium, large etc. I bought the size L for my son who is 10 years old. 75 pounds. , 4'5, thought it might be a bit tall for him to grow into. The size on the product when I received it said 9-10. Why couldn't they put it on the side so I know what "big" means. I would buy Xlarge. Luckily it's thin to fit in a shirt, haven't tried pants yet.