This is incorrectly advertised as a deep pocket fitted sheet that will fit mattresses up to 16" thick. I measured my mattress to be about 12" thick so it seemed like it would be fine. Not so, it's way too short and you cannot tuck under the edges. Very frustrating trying to put it on, you tuck under one side the the opposite side pops out.  Doesn't fit. The actually material quality is fine (soft, comfy, etc.) but it's NOT a deep pocket sheet. Regret this purchase.