I really don't like ordering clothes by my kids' ages but I think my son should be a medium size because I ordered by his height 10 years old and the shorts fit him. He says they're a little larger than his other trunks, but they're just the right length and have an adjustable drawstring and elastic waistband to make them work. He really likes the design and he likes the feel. He said the built-in underwear feels great. And of course they have pockets, which is always a plus.
LUCOWEE Anti Chafe Boys Swim Trunks: Boxer Brief Liner & UPF Quick Dry Technology
55 Review
π Kanu Surf X Large Boys' Swim Rashguard Sleeve - Premium Protective Clothing for Swimming
43 Review
π©³ Beautyin Toddler Boy's Swim Trunks: Printed Swim Shorts for Quick Dry Beachwear
46 Review
Platinum Rashguard for Boys by Kanu Surf
54 Review
Waterproof Cozy-Dry Rain/Snow Pants for π§ Kids by JAN & JUL, with Fleece Lining
64 Review
π₯ Stay Warm and Active with Rocky Fleece Thermal Underwear Bottoms for Boys
44 Review
Funny Guy Mugs Tearaway Sweatpants: Playful Boys' Clothing for Fun and Active Days
49 Review
Boys' Adidas Active Sports Tricot Athletic Clothing
45 Review