solid concept and good implementation [SEP] i love the idea of having something like this that does not require pre planning on my end like microwaving or heating which i always invariably do not do i have different masks requiring that type of minimal effort that i have never used and i love the idea of disposable something i can take with me when i travel but do not need to worry about bringing backthis activates on its own as you can see from the box packaging instructions i am guessing it just gets activated when exposed to air or when taken out all i know it started to heat up within a few seconds of being taken outit is super light and compact which lends to one small disadvantage of not staying on there is no weight that pushes it on i just used it with my sleeping eyemask and that applied the exact amount of pressure i would likethe thing i could not figure out it might be a specific batch flaw or i might have not been able to figure it out was where and how to affix it to the ears the packaging seemed to imply there are things you could pull but i could not find anyother than that i found the intensity of heat to be great it is not too hot especially for sensitive skin and especially for a sensitive area like the eyes and it lasts a good amount of time that i managed to squeeze in quite nicely some meditation