<p>Can someone tell me what the dimensions are for the mattresses - The webiste gives measurements for the bed itself, but doesn't mention the mattresses. Some are 9" deep, some 15" deep -- and I'm assuming a Twin size XL, correct? We've received information from a merchant that wants to sell linens that are "guaranteed" to fit, but our daughter would like to know her choices.</p>
<p>Twin XL is the correct size.</p>