How many watts are they likely to be worth? I have some of these but they seem a bit flappy http://www.specializedconceptstore.co.uk/elasticised-shoe-cover/36397/apparelcustomshoecovers
They are covers for cold weather. They are probably slower than shoes without covers.
@Kompute started
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How many watts are they likely to be worth? I have some of these but they seem a bit flappy http://www.specializedconceptstore.co.uk/elasticised-shoe-cover/36397/apparelcustomshoecovers