Since it is double-sided (Memory Foam side and Waterfoam side), is the Sunshine suitable for all seasons?

Yes. Its dual-comfort design and highly breathable materials ensure excellent comfort throughout every season. The Memory Foam side provides a softer, more enveloping feel, while the Waterfoam side delivers firmer, cooler and more breathable support during warmer months. In addition, the mattress's open-cell structure, breathable 3D Air Plus border and exclusive Silver +RESISTAT™ cover continuously improve airflow, helping keep the mattress fresh, dry and comfortable all year round.