They only make an Eastern King.
Both king sizes have the same area.
Eastern King - 76” x 80”
Cal. King - 72” x 84”
The Cal. King has the advantage if:
you’re very tall
like to sleep stretched out, with you arms above your head
Have an animal who likes to sleep at the foot end of the mattress.
The Eastern King advantages:
Both tend to show body impressions more easily than the smaller sizes.
And, you will tend to sleep with space between you..since you have the extra space.
Up the center of the mattress will remain like new, which creates a hump.
With the Eastern King, you can rotate the mattress 1/4 turn.
While not perfectly square, it’s close enough to pull it off.
Rotation of a new mattress aids in more ever wear, thus longer life.
The use of a waterproof mattress protector aids in longevity, as well.
Keeping the upholstery material clean and dry helps retard wear.
The most significant source of moisture is perspiration.
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