The iComfort by Serta has a base and cooling upgrade with different layers:
note: the base model only looks to have 1 layer.
Those who want a plush top layer without sacrificing support and cooling. Made with three layers of premium foam, plus foam-encased springs:
The Casper Blog
When we’re not making mattresses, we’re learning everything we can about the power of rest.…
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Thank you for checking out this Serta iComfort vs Casper Nova Hybrid mattress comparison. We have tried to compare all the necessary information to help you choose which mattress is the most suitable for you.