The Side-Out Foundation is a 501(c)(3) non-profit organization that was established in 2004 to unite volleyball players and coaches and to have them work toward the common goal of making a significant and identifiable difference in the lives of breast cancer patients and their families. The organization's goal is to advance clinical trials, increase compassionate support services and educate communities. Side-Out supports teams nationwide in their volleyball tournaments, clinics and other fundraising efforts. The foundation offers practical support for fundraising in addition to educational material for participants in order to help them become effective advocates for breast cancer. It contributes the funds to organizations that serve breast cancer patients, whether it be in the form of research, medical services or compassionate support.

The term side-out refers to a situation in volleyball when one team wins a point while its opponent is serving, thereby regaining serve or control of play. It is hoped that Side-Out will do the same for breast cancer patients, providing them with the support, education and best available treatments to regain control of their lives.