This mattress topper is designed so that the whole area of the mattress topper is breathable, not just certain areas. This ensures that, at all times regardless of your sleeping style, you are always in a safe and secure position. Using innovative highly breathable memory fibre, this is an aid which is comfortable, practical and most importantly can play an important part in the prevention of SUDEP. The cover is made from spacer fabric which helps to increase air flow, whilst providing support for the body. The cover is fully removable, and is machine washable. The Breathe-zy Anti-Suffocation Mattress Topper comes in a thickness of 5cm (2″).