
Got this to protect my daughter's 5 inch depth memory foam mattress and it fits perfectly.

A lot of the other options I was seeing were deep depth. Also like that it is a total incasment of the mattress instead of fitting like a fitted sheet.

Waterproof Twin XL Mattress Encasement With Zippered 6-Sided Cover, PlushDeluxe Premium Quality, And Cotton Terry Surface (Fits 12-15 Inches H)
14 Review

Protect Your Mattress With A Premium Cal-King Waterproof And Breathable Cover - Deep Pocket And Noiseless Design For A Comfortable Sleep
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Twin Size Zippered Mattress Protector Encasement - Premium Terry Absorbent Cover With Six-Sided Waterproof Protection - Quiet, Breathable, And Fully Washable
43 Review

2-Pack Twin Size Mattress Protectors With Waterproof And Cooling Features - Soft Bamboo Cover, 3D Air Design, Noiseless And Breathable Mattress Pad, Fitted For 8-18 Inch Deep Pockets
18 Review

🔌 AGPtEK Electric Air Pump: Portable Quick-Fill Inflator/Deflator for Camping, Boats, Mattresses & More!
3 Review

🏊 FLEXTAILGEAR Tiny Pump: Portable Ultra-Mini Air Pump for Pool Floats, Air Bed, Mattress, and More – USB Rechargeable with 1300mAh Battery
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🛏️ Intex Inflatable Pull-Out Bed Series
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🛏️ SleepLux Durable Inflatable Air Mattress: Built-in Pump, Pillow, USB Charger – 15" Tall Twin Comfort
5 Review