This mattress is recommended for solid foundations and platform bed frames.

Elevate your Be Well Mattress with this 2″ Foundation, which turns any bed frame into a platform frame. The solid wood foundation is crafted from sustainable wood sources and it contains no plywood or particleboard, ensuring that it’s made with no toxic glues or formaldehyde. The solid wood construction contains no springs, which can warp and wear out over time.

Via Design Within Reach