52-54 cm. The XS size of Le Fei hat is generally suitable for people with a head circumference of 52-54cm. Philo, whose Chinese name is Philo, was founded in the Italian town of biella in 19 1. Now it is a century-old sports fashion brand. Feile is a textile and knitting clothing brand founded by Feile Brothers. In 1970s, in order to cooperate with diversified development, Philo turned to sportswear and successively developed tennis, golf, fitness, skiing, mountaineering, basketball and other series.