I ordered a few of these and they were perfect, XL fit my 14 year old best (who seems to have some XL teen sizes and some S adult sizes), L fits my 12 year old. You say comfortable, not too transparent, just right.
🍉 Fruit of the Loom 6 Pair Cushion Ankle Boys' Clothing: Comfy and Stylish Selection for Active Boys
57 Review
Waterproof Cozy-Dry Rain/Snow Pants for 💧 Kids by JAN & JUL, with Fleece Lining
64 Review
👖 Boys' Outdoor Climbing Convertible Trousers - Waterproof | Clothing
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Funny Guy Mugs Tearaway Sweatpants: Playful Boys' Clothing for Fun and Active Days
49 Review