Fits well on my Twin XL mattress with lots of room both length and width, mostly width. My mattress is 80" x 38" x 9". It's *not* firm. My nose is cleaner compared to other mattresses, sheets and pads, but who knows how long these others have been in use or how many times they've been washed Q Overall I'm happy with this product because it fits my XL twin mattress even if it doesn't fit that size and my nose gets sore with this product and the following AllerEase Cotton Allergy Protection Pillow Protector, Beautyrest 2 Hard Pillows Extra Firm Pillow Set Clearer for Back & Side Sleepers 2 Pack Standard.If you want a fresh start when it comes to bedding I recommend all of these items and a mattress (zipped) - yes the mattress topper will fit and my sheets will too .With a stretch H skirt with deep pockets, Twin XL
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