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The iComfort by Serta has a base and cooling upgrade with different layers:
note: the base model only looks to have 1 layer.
The Zephyr Mattress is made of 5 layers of polyurethane foam:
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Thank you for checking out this Serta iComfort vs Polysleep Zephyr mattress comparison. We have tried to compare all the necessary information to help you choose which mattress is the most suitable for you.