The core also includes breathable fibre inner walls that promote air flow through the mattress, which keeps baby cool and comfortable in all seasons. What’s more, the All Seasons mattress comes with a dual sided cover that helps to regulate baby’s temperature and keep them comfortable all year round. The spring/summer side of the cover features airflow mesh, providing enhanced breathability and cooling properties in warm weather. While the autumn/winter side of the cover features bubble textured soft jersey fabric to retain warmth in those colder months.