"PC99 poly/cotton sateen combined to 4oz poly wadding - 315gsm. Offering several insulating benefits that have been independently tested and proven by laboratory tests. The results show a ten-fold increase* in thermal resistance when compared to a standard thermal lining, it's so effective it has an equivalent 2.2 tog rating! Specifically developed to help boost heat retention to reduce drafts, conserve energy and keep the warmth in. Thus helping with the rising costs of energy for your clients. Trapped air creates the thermal resistance and the most effective barrier to keep the cold out and the warmth in. *Thermal resistance (K-M/W) independent results show thermal resistance at 0.2322 for the super thermal lining and 0.0286 for the standard thermal lining . Tested under 10°C-30°C test conditions."