The comfort layers in a mattress with proper support will compress over time. This is considered a body impression as the mattress is expected to develop a slight indentation where you normally lay. Anything beyond 1½” may be an indication that the mattress does not have proper support or there may be a potential defect in the internal construction. If the mattress has proper support and the comfort layers are compressed more than 1½", we would be happy to send one of our factory-trained service technicians to inspect your purchase to determine if the compression is normal! Please contact Customer Care by calling 1-860-474-1000 or 1-800-569-1284.