USIndoor is a member organization of 400 sport facilities, startups and vendors. USIndoor offers a range of products and services that support multi-sport indoor recreational sport facilities. Corporate affiliates offer numerous products and services relating to facilty construction and development, operation and programming. USIndoor holds an Annual Conference & Trade Show, publishes two national magazines (GO Indoor and GOAL Online), provides numerous members-only services, administers a vital social media presence, promulgates Official Rules and certifies referees for indoor soccer, and provides online news and information at USIndoor.com. The Sporting Goods Manufacturers Association has estimated that the US indoor soccer market, alone, consists of 4+ million youth and adult players.