My wife is very sensitive to light and has tested many sleep mask in the past. She mostly used those distributed in aircraft by the airlines, which are rather decent quality. The main concern with these masks is that they do not provide good protection over the long term. Before purchasing the LivingSilk, we never found a quality alternative to these air masks. I was asked to test and evaluate the product in exchange for an honest review and given the situation of my wife, I agreed to do it. The mask is made of silk inside and extra soft tissue, so it is extremely soft and easy to wear. There is a small lip at the bottom of the mask, which contributes even more light blocking. In general, it is simply the best mask that my wife has ever used. It does exactly what it's supposed to do: protect from light while remaining comfortable to wear over time. I am very happy to recommend the purchase of this mask.