The only reason why this is not getting the full 5 stars is the mocking that my husband has done while using it - i sleep so deeply I apparently look hilarious. We have uneven sleeping patterns and a relatively bright room due to a french door out to a widow's porch. This mask allows me to keep the bright out when the hubs starts reading in the middle of the night and the morning sun be less of a thing during the mornings I get to sleep in. I haven't even used the freezing option as the weight of the packet is soothing enough. And I notice that some folks have had a hard time with it keeping on your face - I did too. But, if I wear a pony and tuck the straps behind my ears AND under the pony, it has stayed pretty well put.