What is a thermal lining?

What does a thermal lining do? What do I need it for?

Thermal lining is an insulator layer that is inserted into the blind which helps keep in warmth. In addition it also provides a dimout quality and also dampens sound.

Blackout blinds do also offer a thermal advantage they can reduce heat transfer by up to 24% helping your room stay warmer in winter and cooler in summer.

A thermal lining isn't necessarily needed in all cases but it is all down to personal preferences.