Mason (hip) is participating in Wednesday's practice, Nick Wagoner of ESPN.com reports.

EDGE Analysis

Mason missed last Sunday's preseason game against the Saints due to hip soreness, but he's now managed to retake the practice field. Elijah Mitchell (hamstring) also resumed practicing Wednesday, and Isaac Guerendo did so Tuesday, so San Francisco's backfield suddenly looks healthy behind top RB Christian McCaffrey (calf), who remains on track for Week 1.