inside OUR COOLING ITEMS IS A BIO-DEGRADABLE WATER POLYMER WITH NO ADDED CHEMICALS OR FERTILIZERS. THE ONLY BRAND WE USE IS Horta-Sorb®. IT IS THE BEST GEL POLYMER FOR WATER MANAGEMENT. GEL POLYMERS ABSORB WATER UP TO HUNDREDS OF TIMES THEIR WEIGHT. WE CAN SUPPLY A COPY OF THE MSDS SHEET IF NEEDED.