Vindra Flex Non slip & Universal Winter Barefoot Shoe (Waterproof Arctic Non slip & water resistant winter barefoot shoes (Unisex Vindra Pro Non slip & universal winter barefoot shoe (Waterproof) Carter Pro Non slip & universal winter barefoot shoe (BOGO Arctic Non slip & water resistant winter barefoot shoes (Unisex. Put an end to stiff and immobile shoes! Stiff soles and immobile shoes can cause painful symptoms in your nervous system and do not support your natural anatomy.?? The most natural way to run is barefoot. The ultra light and flexible 4mm thin sole allows a?? natural gait?? and prevents irritating knee, hip, and back pain.