I bought these as stocking fillers for Christmas 2011, for my 11 and 8 year old. I wasn't expecting much as i had read mixed reviews on this type of product. The children have used these daily,whether they have cold hands or not!! They fit inside our gloves (even mine...as i have 'borrowed' them!), they are very warm within seconds of pressing the metal discs and half an hour later there is still residual heat, you then just boil them for a few minutes and they are ready to reuse. They have been ideal for walking to school, shops etc...much less moaning...worth the money just for that! This set i think are particularly good value at 4 for under £7 with postage!