The Flexyren range of products are materials made from agglomerates, generally cork with rubber or polyurethane, or recycled rubber. The objective of these materials is to achieve the thermal and acoustic insulation properties of cork together with the elastic properties of rubber.

Cork is the outer bark of the cork oak (Quercus Suber L.), the 100% natural plant tissue that covers the trunk and branches. It consists of a honeycomb structure of microscopic cells filled with an air-like gas and coated primarily with suberin and lignin. One cubic centimeter of cork contains around 40 million cells.

Cork is also known as "nature's foam" due to its alveolar cell structure. It has a closed cell structure that makes it lightweight, waterproof and airtight, resistant to acids, fuels and oils, and resistant to rot.

Specialized professionals harvest it sustainably without damaging the trunk, allowing another layer of outer bark to grow on the tree that, over time, will be harvested again.

Over the course of the life of the cork oak, which lasts an average of 200 years, the cork can be stripped around 17 times. This means that cork is not only a natural raw material, but it is also renewable and recyclable.