My grandson is size XL (16-18) in boys, what size would he be in a

In pants, what size comes after 18-20? - Quora

Real Essentials Boys Undershirts, 5 Pack Dry-Fit Moisture Wicking Performance Undershirts Sizes S (6-7) - XL (16-18), Boy's, Black

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Little Star Organic Boys Briefs Underwear, 10 pk, Size 6-20, Boy's, Size: XL (18-20), Blue

My grandson is size XL (16-18) in boys, what size would he be in a

Boys' Clothing Size Chart.

Athletic Works Boys Fleece 5-Pack Sweatpants, Sizes 4-18 & Husky