Positive Foundation PF stands for Posture Foundation. Developed in 1933, this patented insole technology set a new standard in all around sneaker comfort. The insole technology was ﬁrst used in BF Goodrich shoes. It involves a wedge-like insert that moves weight to the outside of the foot, evenly distributing weight, reducing leg strain. As the success of the sneakers with the Posture Foundation insole technology grew in 1937 it became the basis for the brand name, "PF Flyers."
In the 1930s and early 1940s PF Flyers was making sneakers, as well as oxfords, boots and heels. Sport styles by PF were very popular in the 1950s, renowned for helping you "run faster and jump higher." This ability would be a result of the improved ﬁt of the foundation, but similar foundations were ﬁnding their way into competing brands, PF Flyers had the ﬁrst collaboration between a sneaker company and pro athlete in the 1950s, when they teamed up with Bob Cousy, the famed Boston Celtics star to created a string of classic basketball designs.
By the 1960s, PF Flyers was one of the largest sneaker brands in America. With the brand's increasing popularity, women were able to buy dresses made to match their PFs, and PF was standard issue in the US Army. The brand was purchased by Converse in 1972, but later had to be sold off when the US government ﬁled an antitrust suit claiming that if both companies combined they would have a monopoly for sneakers. PF Flyers were featured prominently in the 1993 ﬁlm The Sandlot. Towards the end of the ﬁlm, the character Benny wears an all-black pair of Center His. The style is now available under the designation, Center Hi Sandlot Edition. In recent years, the phrase "wearing his PF Flyers" were commonly used.