To be honest about it, most of the Fleece lined wellies will keep your feet warm. And there is the rub. Your feet need to be warm to start with. Fleece lined wellies retain the heat, as do most of the purpose made socks. They do not generate heat, so if you start with cold feet, you are going to have cold feet all day unless you walk about for a bit and generate some heat into your feet. A lot of people blame their wellies for their cold feet, when in fact the blame lies in their circulation.