Handle warmers can be divided into two different groups – full hand warmers and separate handle warmers.
Separate handle warmers: Works with separated handles and ergonomic handles. Allow you to keep your hands as wide or narrow as you like. Some models may be smaller in size and therefore not fit larger hands particularly well.
Full hand warmers: Plenty of space for your hands, and can be used with extra gloves for those who get really cold. Do not work with separated or ergonomic handles.