What is fabric content? 100 percent cotton? Or?

It was a a gift for a College student. They picked it out and I purchased it.

Will it help my fitted sheet from slipping off at the corners or make them more likely to slip off?

It didn't make a difference. Mine don't slip off, but didn't before..

Is it necessary to wash this before putting it on the bed?

Hi! Thank you for your interest in our products. That is a great question. This product does not have to be washed before use, however if you wish to wash it before hand please reference the care instructions and follow them as closely as possible. We hope this helps. If you have any further questions, please contact us at cs@linenspa.com. Thank you again and have a wonderful day. Linenspa

What is the dementions of this product.

Hi Amazon customer, great question. The length and width of the mattress encasement, will depend on the size. If you select the size you are interested in, the listing will update to reflect the correct dimensions in the bullet points. Regardless of size, this encasement will accommodate mattresses up to 12 inches thick. If you have any additional question, please reach out to us at cs@linenspa.com. Thanks! Linenspa

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Linenspa Zippered Mattress Encasement – California King Size Waterproof Mattress Protector – Quiet Cover & Complete protection – Dorm Room Essentials, White

Linenspa Zippered Mattress Encasement – California King Size Waterproof Mattress Protector – Quiet Cover & Complete protection – Dorm Room Essentials, White

4.6/5

Product ID: 17066193

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Details

Brand
Linenspa
Color
White
Size
California
Fabric Type
Soft Brushed
Special Feature
Flexible

💧100% waterproof barrier

🔒360˚ zippered full mattress protection

🛏️ultra-thin, noiseless breathable fabric

Description

💤 Sleep protected, sleep perfected—wake up worry-free every night!

AQUA TIGHT DEFENSE - Keep every drop out with 100% waterproof technology—no stains, no stress.
360 ˚ ZIPPERED SHIELD - Complete mattress coverage that locks in freshness and locks out allergens.
WHISPER QUIET COMFORT - Ultra-thin, breathable fabric ensures your sleep stays peaceful and undisturbed.
EFFORTLESS MAINTENANCE - Machine washable and dryer safe for hassle-free, fresh sleep every night.
TAILORED FIT FOR EVERY BED - Available in multiple sizes including California King—perfect dorm essential or upgrade.

The Linenspa Zippered Mattress Encasement offers 360˚ waterproof protection with a quiet, ultra-thin breathable fabric that fits mattresses up to 12 inches deep. Designed for easy care with machine washable and dryer-safe materials, it ensures a fresh, allergen-free sleep environment in sizes from Twin to California King.