Vibram Five Fingers Performa was designed to enhance a barefoot feeling. The kangaroo leather upper feels soft against the bare foot, yet is strong and tear resistant. The Performa was designed primarily for indoor use during fitness training, CrossFit, and for after sport. The sole is not designed for extended use during outdoor activities like trekking, running, or water sports. Product description: â—?Vibram Five Fingers Performa â—?higher coverage on your feet â—?thin, abrasion-resistant stretch polyamide mesh fabric â—?Footbeds feature AEGIS Microbe Shield antibacterial treatment to help control odors â—?Razor siping on soles provides sure grip on wet and slippery surfaces â—?balance and comfortable