Comfort Rating Comfort Rating: 3 is the level of filling comfort achieved by laying on the mattress. This is not a firmness rating. Memory Foam Warning Due to the fire retardant spray, you may expect a slight odour which should disappear within 2 - 4 weeks. Reflex Foam Reflex foam is made from polyurethane which is the same material that memory foam is made from, however it doesnt contain the added temperature technology. The foam is made up of bubbles as oppose Medium Firm is the level of support to the body, suitable for average to heavily weighted people. This is not a comfort rating. Micro Quilted A finish to the mattress created by stitching together the fabric and fillings, creating a patterned comfort quilt layer. Vacuum Packed This mattress is delivered rolled up for easy manoeuvrability. Please allow 4-24 hours for it to fully inflate. Anti Allergy recommended, this mattress is suitable for allergy sufferers due to its fillings and fabric. One Sided mattress, no need to turn this mattress, but rotation is recommended. Source 2 Domestic Flamability Rated Source 2 for Low Hazard, General Domestic use Handles Attached to the border, aiding rotation and turning of the mattress. Pillow Top effect, that looks separate to the mattress but is actually attached with a hidden return, usually has soft fillings. 20mm Of Memory Foam is body moulding and pressure relieving, a filling that always recovers to its original state, ultimate comfort.