Kitchens also tested Plank Firm’s flippable mattress — which the brand says is the firmest on the market — and discovered that the “ultra firm” side was, in fact, the firmest memory-foam ...

Firmness and Support: One side of the Plank Firm is considered “traditional firm” while the other is “ultra firm.” Who Tested It: Simone Kitchens, Strategist senior editor and a back-to ...

The Plank Firm Luxe features a unique flippable design with two levels of firmness—one Firm and one Ultra-Firm. On both sides, the mattress’s blend of memory foam and individually wrapped ...

While stomach sleepers should avoid soft mattresses, most of our top picks aren't ultra-firm and have a medium-firm feel instead, which will also suit combination sleepers. Our top pick for the ...

Reviews and recommendations are unbiased and products are independently selected. Postmedia may earn an affiliate commission from purchases made through links on this page. They say: A collection ...

McKenzie, a Certified Sleep Science Coach and proclaimed mattress expert, has been writing sleep content in the wellness space for over four years. After earning her certification from the Spencer ...

If you're a back or stomach sleeper and need a supportive new mattress, the Helix Twilight may be worth considering. Here's what our sleep experts thinks of this Helix mattress. A certified sleep ...