The Grand Mosque in Makkah is one of the holiest sites in Islam and attracts millions of pilgrims every year. The marble floors of the mataf area within the mosque are known for their coolness even in extreme temperatures. Many people wonder how the floors remain cool, and some even believe that air conditioners are installed under them. However, the General Presidency for the Affairs of the Two Holy Mosques has revealed the true reason behind the coolness of the floors.

The coolness of the floors is attributed to the Thassos marble used in the mataf area. Thassos marble is imported from Greece because of its unique properties, including its ability to reflect light and heat. During the daytime, the marble reflects the sun's rays, and the heat is dissipated, resulting in cool floors even in high temperatures. The marble is also able to absorb moisture through minute pores during the night and excrete it during the day, which further contributes to its coolness.

Thassos marble is the most white and rare marble in the world, and it is one of the purest and most solid natural stones. The thickness of the marble used in the Grand Mosque reaches five centimeters, and it is processed in private Saudi factories under the supervision of qualified technical cadres to cut the pieces into tiles of certain sizes and special standards.

The coolness of the floors in the mataf area of the Grand Mosque in Makkah is a result of the unique properties of Thassos marble. This marble is imported from Greece because of its ability to reflect light and heat, and it is processed in Saudi Arabia to be used in the mosque. The use of this marble is an example of the attention to detail and quality in the construction of the holiest sites in Islam.