Sierra 2.5" Memory Foam Mattress TopperIn stock selection varies by location. Add plush, pressure relieving comfort to any mattress with a 2. 5 dual layer memory foam design and smooth touch quilted surface. Cooling gel infusion helps regulate temperature, while breathable 3D mesh side panels enhance airflow and ventilation. The result is a softer, cooler, more supportive sleep experience, perfect for refreshing an existing mattress or elevating a new one.