SACRAMENTO, CALIF. — The Sacramento Running Association (SRA) is excited to announce that OS1st will return as the Official and Exclusive Sock and Compression Sponsor of the California International Marathon (CIM) for 2026.

This year, CIM finishers will receive an exclusive CIM-branded premium OS1st sock.

This partnership marks a continuation of the successful collaboration established in 2025, further solidifying OS1st’s role in supporting thousands of runners on their journey from Folsom to the California State Capitol.

Building on the momentum of the previous year, OS1st will be deeply integrated into the runner experience, from the first training miles to marathon weekend festivities and the celebration at the finish line. The 2026 partnership will feature several opportunities to snag limited-edition CIM x OS1st swag, including the Official CIM Launch Party in July, the CIM Expo, Official CIM Shakeout Run and CIM finish line experience.

“We are thrilled to welcome OS1st back for the 2026 season,” said Scott Abbott, Executive Director of the Sacramento Running Association. “Our goal is always to provide CIM participants with the highest level of support as they chase their goals on this iconic course. OS1st’s commitment to performance and recovery directly aligns with our mission to provide a world-class experience for every athlete.”

For more information on the partnership and to stay updated on the 2026 race, visit https://runsra.org/california-international-marathon/.

California International Marathon is a premier road race founded in 1983. It is a top achievement for marathoners and a major qualifying race for the Boston Marathon and the Olympic Trials.

Sacramento Running Association is a non-profit organization dedicated to finding ways to encourage people of all ages and abilities to run. The SRA is committed to developing new, quality running events that appeal to a broad variety of runners.

OS1st® is a performance sock and targeted compression brand built on decades of hosiery innovation and bio-mechanical insight. Using Compression Zone Technology®, OS1st engineers support where runners actually need it—optimizing the critical interface between foot, sock, and shoe. OS1st is headquartered in Hickory, North Carolina and trusted by runners and specialty retailers across the country.