The Nest Cup is a 20cm mattress. It has 5cm of HIGH DENSITY MEMORY FOAM. If you are looking for a medium supportive durable mattress, this would be a great choice. 

• 5cm of a quality high density memory foam                                                                                              
• Removable washable 280gram cover
• Extremely comfortable mattress with optimum support
• Value for money purchase
• Suitable FOR UP TO 18 STONE
• Order today sleep on tomorrow
• Medium or Firm Option