Castore was founded by brothers Tom and Phil Beahon in 2015. The brand initially gained recognition for its focus on high-performance sportswear, using advanced materials and innovative designs.
Castore entered the world of soccer by securing kit sponsorship deals with several football clubs. The brand's approach emphasized premium quality and tailored fit, seeking to distinguish itself in a competitive sportswear market. One of the significant milestones for Castore in soccer came in 2020 when the brand signed a multi-year deal to become the official kit supplier for Rangers Football Club in Scotland. The partnership marked Castore's entry into top-flight European football.
Castore's partnership with Rangers FC was notable for the design and release of bespoke kits for the club. Rangers supporters praised the quality and aesthetics of the kits produced by Castore. Following the success with Rangers, Castore sought to expand its presence in soccer by securing additional kit sponsorship deals with other clubs. The brand aimed to position itself as a viable alternative to more established sportswear brands in the football market.