Blackout with Thermal Fabric Technology This blackout curtain made of Thermal fabric technology which ensures their quality features especially in light blocking and makes them heavy and durable yet soft on touch The quality of the curtains are 260 GSM (Grams per Squar Meter) while in UK online Market the standard of the microfiber curtains are 230-240 GSM. Overall these are very suitable curtains for your Bed rooms, Living rooms or Drawing room.