Meindl builds a retractable spike system into its winter boots
Retractable Spike Red – Turnpike Comfort Footwear
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Helsinki 1E Mens Snow Boots w Red Laces - Black – THE SKI PROJECT
NexGrip Waterproof Women's Snow Boot Brown Bootie with Retractable Ice – Bridge Street Bazaar
These Naot Boots Were Built With an Ice Pick to Prevent Slipping
Retractable-spike winter boots give ice a kick in the rear
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The Reversible Cleats Leather Boots - Hammacher Schlemmer