When we ordered this Vinyl Mattress Cover, we were unsure which size to order. The sides of our mattress are nine inches but the middle is thicker. We ordered the nine inch size and it fit with plenty of room. It was made of a thick material and was not a flimsey cover. Overall, we were very pleased with it. The one disappointment was that the seams were not very strong. One seam split while we were trying to get it over the mattress. We would buy another one if needed. This Vinyl Mattress Cover is 6 gauge (6 mil), which is as thick as they come without paying a LOT more. To avoid tearing, my advice is to do as I did and order one size larger than needed. This provides enough slack to prevent tearing. You can always just tuck the surplus under the mattress. For my standard twin mattress, I ordered a Twin XL, and for my standard queen mattress, I ordered a California King
Product Features Vinyl Mattress Cover with Zipper
Size: King (16" Deep)
• 6 gauge vinyl mattress cover• Reinforced zipper for total protection
• Waterproof, stain resistant
• Wipes clean with a damp cloth
• Machine washable/dryable
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Vinyl Mattress Cover with Zipper