All bulk insulation materials have a Thermal Resistance or R value which is a measure of their performance. The thermal resistance, R-value is the ability of the insulation to resist the transfer of energy in the form of heat and is the most important factor when selecting insulation. The higher the R-value the more effective the insulation. 

The R-value should be visibly displayed on the packaging. When purchasing a geyser pack, compare R-values and ensure that you are getting the best “R-value” for your money. 

Note: R-value is dependent on the thickness of the material and care must be taken not to compress the material when wrapping your geyser.
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