P******
Warms up very quickly, smells like herbs. On cold days, my feet are cold, so I use 1 pack every time I go to bed. After peeling it off and putting it on my feet for about 1 minute, it starts to warm up, helping the soles of my feet to be warm and not cold anymore, making it easier to sleep. The small pack is very convenient to carry with you when going to work or going out.