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Never bend an innerspring mattress.   Never bend a foam mattress more than 30 degrees.

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Use a quality bed frame to avoid structural damage and voiding of your warranty.  Queen and king size sets must also be used with rigid center support witha leg or bed slats.

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If you purchased a mattress only, it must be supported by a quality comparable box spring.
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Keep clean by using a mattress pad or bed sack and vacuuming regularly.
 

Do not get the mattress wet.
 

Do not use an iron or apply excessive heat to the mattress.