There are 2 models: the "walker" and the "pro". This is what the yaktrax folks say about the pro:
The Yaktrax Pro is new on the market and designed for the more active winter person. A mail carrier, runner, outside worker or someone who faces winter conditions on a frequent basis. They are made of the more durable rubber blend and have a removable strap, should you go into deep snow. We have police officers, runners, crossing guards and many other professional using the Pro.
And the website has many pictures of people running in them.




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