SafeRest
King
Waterproof Mattress Protector, King
4.6 (280,612 ratings — across all sizes of this protector)
The protector that made our name, cut for the 76 by 80 inch King surface two people actually share.
Cal King
SafeRest Waterproof Mattress Protector California King Size
4.5 (3,600 ratings — across all sizes of this protector)
A California King is a deliberate purchase, and the Essential is the protector for owners who want it insured without touching how it feels. It is a thin absorbent fitted layer that blocks spills, urine, sweat and stains, breathes instead of banking heat, and stretches over profiles up to 18 inches deep — the longest bed in the house, covered edge to edge and completely silently.
$28.99
Price checked 2026-10-16
Available to order
Your order is placed with and fulfilled by our retail partner — with its delivery network, tracking and return window.
Three layers of thinking
1
Barely-there build
The Essential adds a barrier and nothing else. On a mattress chosen for a specific feel that is the entire point: the comfort and breathability you paid for stay exactly as they were.
2
Full waterproof coverage
Thin is not partial. The barrier spans the whole sleep surface and stops liquid outright, which on a bed this expensive is the difference between a wash and a warranty claim.
3
Smooth 18-inch fit
Deep stretch pockets grip the long California King profile and keep the surface tight all night rather than shifting toward one sleeper by morning.
The night test
Two-sleeper verdict, same as always: if neither of you can locate the protector by sound, warmth or texture, it has done its job. The only evidence should be a clean mattress at the next rotation.
Care
Cold wash, low tumble dry. Wash it on its own — a California King needs space in the drum to dry evenly — and it is back on the bed the same day. Full care guide →
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