OK, OK, it's not a sheet mask, but it is equally as fun. Much like the sheet mask, the bubble mask has gone viral. Wundertox (£20) gel to foam formula starts out as a treatment gel and begins to foam, clearing the skin of impurities in pores (by now you've probably seen those bubble mask photos). It's a fun, alternative way to switch up your skincare routine to combat impurities and environmental pollutants in the skin.