The hot air is first passed through the cooling pads the cooling pads which already absorbed the cool water are ready to transfer the cooling to the air the cool air came out of the cooling pads immediately circulated outside with the help of fan. Keeps your cooler operating at peak Cooling Efficiency by replacing your natural Grass pads regularly. This pad sets are all natural. These pads are specifically sized to fit all desert, personal, mini. This pad is the most efficient and economical cooler pad in the market. The Pad construction allows for even air flow throughout the entire pad,Mainly Grass covered with Net