When is comes to boys, you need a sock that is comfortable that they will wear them and durable so they will last. This sock is the perfect combination. Great arch support so it helps prevent slippage, and target ventilation so it keeps their feet cool and dry. The reinforced heel and toe, helps the durability of these socks, meaning not so many holes that boys are notorious for putting into their socks. Zoned cushioning makes these sock extremely comfortable and cozy too. Size Medium fits shoe sizes 9-2.5, and Large fits shoe sizes 3-9. Please note: Socks are not able to be returned or refunded if they have been removed from their original packaging.