Sierra Sleep Advanced California King Mattress Protector

The Sierra Sleep Advanced Protector wraps your California King mattress in a soft, breathable barrier that keeps spills, sweat, and dust mites where they belong: outside the mattress. It is built with a moisture wicking, cool to the touch fabric that works quietly beneath your fitted sheet without changing the way your mattress feels.

The waterproof layer is designed to repel liquids and resist stains while staying soft and stretchy against the surface. It fits mattresses up to 18 inches thick, so it works well with hybrid, memory foam, and innerspring mattresses, including taller profiles. The protector is also compatible with adjustable power bases, so it will not restrict movement or bunch up as the base flexes.

Why it helps

• Moisture wicking, cool to the touch fabric for a comfortable night's sleep
• Waterproof barrier repels liquids and resists stains without a plastic feel
• Helps guard against dust mites
• Fits mattresses up to 18 inches thick
• Works with hybrid, foam, and innerspring mattresses, including power bases
• Machine washable for easy care

A mattress protector is a simple, inexpensive way to extend the life of a new mattress. Most mattress warranties require ongoing protection from stains and moisture, so a good protector is worth adding on day one, especially on a large California King mattress that represents a bigger investment to protect. Because the fabric stays cool and soft rather than crinkly or plastic feeling, you get the peace of mind of a waterproof barrier without sacrificing the comfort of your mattress underneath.

Care is straightforward: the protector is machine washable, so spills and everyday wear come out in a normal wash cycle rather than requiring special cleaning. That makes it a practical fit for households with kids, pets, or anyone who simply wants an easy way to keep a mattress fresh between deeper cleanings.

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Series: Advanced Protector (Ashley model M30905)