After using these for a month I feel like I give an assessment of the product. I purchased the white in twin XL long for an adjustable bed. I am used to 100% cotton, so this blend definitely has a smoother feel and look and is great for summer. The product dimensions for thick mattresses allowed up to 18" and my mattress is about 13.5" and fit it fine. Because these are made for a variety of thicknesses, the elastic allowed the sheets to pull up on my adjustable frame and wasn't overly snug. This was fine with me because I understood they were made to accommodate a lot of brands of beds. My mattress cover has sheer feel to it and is very slick and smooth (Bed Gear) and these sheets slipped a lot on it. This wasn't a negative for the sheets, but added to the issue of the corners slipping off. I tried using sheet "suspenders" but they only worked for a little over a week before slipping off.Overall, I believe these sheets are some of the best for the price and would definitely work for a regular (non-adjustable bed). Just be aware they won't be super tight/snug and you will be happy with them. Also, I have found it hard to find Twin XL for a decent price and this company shipped quickly. Just be aware of your needs before buying and you should be happy with your purchase.