Top positive review
Not exactly instant, but warm!
on 18 May 2013
I get cold hands and I will be going to some outdoor evening shows this summer so needed something to keep my hands warm. Heard mixed reviews about these and how effective they are, and I admit when I initially tried them out I was unimpressed by the warmth. The packet says 57 to 70 degrees c, but at first they were about 20 degrees max. However, once I had left them in my pocket for a few minutes they got a lot warmer and they kept getting warmer!
To activate these you simply open the plastic packaging and remove the hand warmers and squeeze them gently. They feel stiff at first and eventually they go like... well... tea bags is the closest I can describe them as on here and they start getting warm quickly. However, to get them properly hot you need to put them in your pocket or inside your gloves.
But they do get VERY warm and will be a much needed accessory in the winter on the way to work.