OCIA.net has posted their review of the Thermaltake iXoft Notebook Cooling Pad.

The material inside is sodium sulfate decahydrate, Na2SO410H2O, also known as Glauber's salt. This material changes phases (from solid to liquid) at 32 C (90 F), which makes this product excellent at storing heat and is commonly used to store thermal energy for solar heating systems.

Thermaltake iXoft Notebook Cooling Pad Review