NFSI (National Floor Safety Institute) certification letter for products meeting the standard for "High Traction." The NFSI has spent more than fifteen years researching various test methods by which materials can be evaluated for their degree of slip resistance, which has resulted in the most comprehensive evaluation process to date. With an NFSI certified product, one can be sure the manufacturer's claims have been substantiated by an NFSI’s independent third-party test.