Blankets are used to provide insulation / protection against loss of body temperature, according to the requirements imposed by climate / temperature conditions. The insulation capacity of a blanket depends on two factors:
a) The Thermal Resistance of Garments (TOG), a measurement of how well a material resists heat flow, where the higher the TOG rating, the better the insulation. It has to be noted that the TOG does not depend only on the weight or the raw material, but also on the fiber quality, the type of weaving or knitting, and fiber raising.
b) The Air Permeability of the Material, where low air permeability will ensure protection from draughts, while inherent breatheability allows evacuation of body perspiration.