This mattress features a fully supportive combination of 25mm of memory foam & a twin layer spring system Consisting of 1350 pocket springs & 750 Miracoil springs. A breathable airflow border allows air to pass through the mattress to stop excess heat keeping you awake. The internal Eco Comfort & Purotex fibres are proven to help reduce allergens & heat build up. Please note as this is a memory foam mattress, you may expect a slight odour within the first week of use. This is due to the fire retardant spray used on the memory foam.