Warm lined wellies such as the Vierzonord and Parcours ISO
Warm wellington boots lined with neoprene (wetsuit material). It is so effective because the neoprene traps little pockets of air which, once warm, prevent the loss of body heat. Fantastic warm boots are available from Le Chameau (both mens wellingtons and women's wellingtons), Aigle and, of course, Hunter wellingtons. Particularly suited for the depths of winter, these warm wellies will allow prolonged use with the need for all those extra pairs of warm socks.