I have spent an embarrassing amount of money on so called percale sheets. These are the real thing. I washed and dried three times before first use. I have found that if you wash the top and bottom sheets separately they seem to wrinkle less. I would like to mention that I have a 17 inch deep mattress and after washing and drying the fitted sheet fits my mattress perfectly. So, I am not sure how much deeper a mattress they would fit. I love the width of the top sheet because it decreases the nightly sheet battle. I often need to purchase a king top sheet when separates are available. The length is perfect with plenty to tuck in at the bottom. Extra pillowcases are ITEM# 17915418 . It would be helpful if they were available in the drop down menu. I found them by googling the pillowcases.