Zappos.com is proud to offer PF Flyers - Women's Athletic: The legendary PF Flyers action shoe mystique: where does it come from? PF has easily evaded the question since 1937. We do know that Posture Foundation is at the core: a kinetic synergy of comfort and performance that is still ahead of its time. Durable construction, hallmark design elements and smart looks havent hurt either. After more than sixty years, theres still no better way to prepare for adventure than wearing PF.