Abstract: The present disclosure provides improved mattress assemblies, and related methods of use. More particularly, the present disclosure provides advantageous mattress assemblies having a plurality of foam springs (e.g., interchangeable foam springs having different firmness levels) configured to provide customizable comfort and support to a user. The foam springs can be marked/labeled (e.g., color coded; include a firmness identifier, etc.) based on the firmness level associated with each foam spring. The mattress assemblies include foam springs disposed within a portion of the mattress assembly to provide customizable support and comfort to a user. For example, a plurality of individual foam springs with different individual firmness levels can be disposed or positioned within the mattress assembly in various foam spring patterns (e.g., user-selected patterns), as desired.