Always use a cover mattress in bed, because the more layers there are between the spring mattress and the body, the longer your bed will last and will remain hygienic.
The Warm/Freeze cover mattress is a 7 cm thick cover mattress made of foam with high elasticity properties.
The Wool fabric side of the mattress cover gives a warmer (ideal to use in winter) and Freeze gives a cooler feeling (ideal to use in summer).