Ten was perfect for my 10 year old's slim build. But next year they probably won't suit him. I think mesh athletic shorts tend to be larger than these shorts.
Boys' Adidas Active Sports Tricot Athletic Clothing
45 Review
π Boys' Outdoor Climbing Convertible Trousers - Waterproof | Clothing
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π₯ Stay Warm and Active with Rocky Fleece Thermal Underwear Bottoms for Boys
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Arctix Youth Pants Reinforced: Large Boys' Clothing for Active Adventures
46 Review