The Firmest mattress we have. This is for those who want a hard mattress. All the pocket coils are "Offset" (like a honeycomb) and the pocket coils are layered with a 3.0lbs High resolution foam with an ILD of 40. The gage of the coils are 13.5 which is thicker than usual. Thicker coils means a harder mattress. The mattress is finished with a bamboo breathable fabric quilted with a firm 2.0llbs density foam. The surface of this mattress is also firm.