Our new Mycoal Insole warmer. This provides vast amounts of heat for those times when the smaller toe warmer just isn’t enough! The same formulation is used in a full length insole, with a low profile to fit well inside tighter footwear. The insole works well inside all sorts of enclosed footwear types providing you with toasty toes for a minimum of five hours. Remember that shoes made from open mesh weave fabrics might allow too much air to circulate, causing them to run extra hot for a shorter duration!!