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OS1st's first ever Plantar Fasciitis sock featuring award winning, patented FS6 technology. Wearing OS1st FS4 socks during runs or sports activity will aid in preventing plantar fasciitis symptom onset and act as an overall foot health and performance aid. With precise targeted compression levels, the FS4 features Compression Zone Technology that is designed for proper foot support and injury prevention. Add to that, soft, moisture-wicking fabric with anti-odor treatment and padding in the right places which creates a technical performance sock that strengthens the foot structure and prevents Plantar Fasciitis, as well as, overuse injuries. All OS1st products are manufactured under guidelines by the United States FDA for Good Manufacturing Practices (GMP).