A: Hello – If you grandson has a 30’’ waist the L will fit. - Simonne
A: Hello - We appreciate your interest in this comfy belt. There is a stretch filler inside the belt that allows the belt to stretch. We know you will enjoy it. - Tim
A: Hi Terry - Thanks for the question. There is a size chart on target.com, but for a 30in it would be a large. Hope that helps. - Carmen
A: Hi there! You can use the size chart to find the corresponding belt size. Happy shopping!
A: Hi Ayelet - Thanks for asking about this cute, reversible belt. For the best indication of how it will fit, we recommend looking at the belt size chart available on the product page. Have a great day! – Aaron
A: Hi Eccomarco - Thanks for asking about this belt! The XL is 34" Long. We hope this helps with your decision! - Dee