heats up but doesn t fit over entire head [SEP] i was looking for a cap to use while i was using an at home malibu crystal gel treatment pro it s very easy to use con the heat doesn t evenly distribute it is only hot in the back not anywhere around the bottom of my head or the top front of my head also the cap is pretty small and doesn t fit over my whole head i also have short neck length hair so my hair taking up space isn t an issue this is the biggest issue with it but if you re interested in just heating the back it would work i wouldn t recommend it if you have long hair