What fit are The 10/10 Boys T-Shirts?

It depends on the piece — fit is not uniform across the range. The LA to the ends tees and the gold tee are described as a relaxed, oversized cut. The OG T-shirt sits in a relaxed everyday fit. The long sleeve shirts are designed to be worn oversized, and their product pages recommend ordering one size up. Check the individual product page before you pick a size.