From the website:
The Soaring Society of Boulder SSB is based at Boulder Municipal Airport, Colorado. A not for profit club, it has been in continuous operation since 1959. We provide gliders, tows, training and a great social environment to our 170 members and their families at one of the finest soaring locations in the world. Our membership ranges in experience from fresh adoptees of the sport, instructors, national champions to world championship contenders.