Yes, you can use the Layla mattress on either side, depending on the level of firmness you prefer.
Layla Hybrid
Layla Hybrid – Soft Side

Layla Hybrid – Firm Side

Both mattresses tested by our team have a soft side and a firmer side, and the difference between the two is noticeable. This feature makes them ideal for those who don’t know exactly what type of mattress they need for optimum comfort.
Layla Memory Foam
Layla Memory Foam – Soft Side

Layla Memory Foam – Firm Side

Note that Layla Sleep offers a 120-night trial which you can use to sleep on either side of the mattress and see how your body adjusts.