RYNO GEAR6" Coolmax Tactical Combat Breathable Side Zip Boots

Would these fit my 15 yr old son he wears a 9 in shoes should I get 9 or go up to 10 he’s gonna b playing airsoft and I need to buy some just wanted

Buenas tardes la medida es us o mx saludos

What is a good cleaner for this item?

Do these come in a 12 W?