Which foundation to make mattress feel softer

Can you tell me if a flexible foundation for a latex mattress would be best to make the mattress feel softer? We currently have a non flexible slatted base with a 13" mattress-- Dunlop extra firm, dunlop firm, Dunlop medium, and tallalay soft configuration. Thank you.

Hi lpalermo,

Exchanging a layer for a softer one or adding a softer topper would be a much more effective way to soften up your mattress than adding a flexible foundation.

With a 13" mattress many people may not feel a noticeable or significant difference by adding a flexible foundation.

Phoenix