Spend over £25 and get a free £25 cosmetics pack and free delivery.1 Minute Thermo-Purifying Treatment Mask. The new Skin Benefits Self Heating Green Tea Mask helps deep cleanse the skin thanks to an exclusive formula that takes advantage of the beneficial, purifying effects of heat on the face. As soon as the mask is applied it produces a warming effect and in just 60 seconds it acts deeply to help eliminate impurities. The green tea helps absorb Sebum.