Does this bed frame take normal mattresses standard single and standard double? Or is it required to purchase the ones that come with it

Hello, Thank you for your interest. Here are the recommended mattress sizes for the Flair Furnishings Ollie Triple Bunk Bed: Single: 3'0", 90x190cm (top bunk) Double: 4'6", 135x190cm (bottom bunk) I hope this helps. Kind Regards, Bedkingdom