Coir is a product of the coconut tree, and it is sometimes known as coco fiber. The substance is extracted from the hairy husk of coconuts. The coir fibre is very tough. It is elastic and strong, and it hardly deteriorates at all over time. The fibre provides good temperature management (for insulation and mattresses) and sound/wave absorption (sound insulation and microwave absorption). It is hygroscopic and so it binds excess room humidity. 

Coir is cool. Coir is comfortable. This would be exactly the right statement on coir mattress. Coir has a close relation with temperature control. The rubberized coir has a spring quality and does not retain moisture. Therefore the circulation of air between the coir fibers is smooth. And as a result, the foam also remains dry and fluffy. The compression with exertion of pressure is perfect and also comes back to original shape after the pressure is released.