Nice heavy weight sheets but there is NO way they are made to fit 'up to' 16" mattresses. I have a 14" and it's a struggled to get the corners on. It's even more of a struggle to get the bottom sheet to STAY ON. And when the top sheet isn't even wide enough to go to the bottom of the mattress on BOTH sides, that just adds insult to injury.  If you're going to buy them then your mattress should be no more than 13" thick. If I could return them I would but probably will try to find someone in the family that can use them or donate them.