Amazing product: the mask actually stays in place once wrapped around your head, and it does not slide off due to movement in your sleep. It shuts out all light, hence giving total darkness all through the night. Furthermore, the quality is amazing: the fabric feels very smooth against your face, without the "tight" feeling regular masks can give. Unlike the regular masks, the Remly Sleep Mask also doesn't cause dryness in the eyes when removed in the morning. In conclusion I can highly recommend this mask :)