The San Francisco 49ers have signed cornerback Jack Jones to a one-year contract, enhancing their defensive backfield. Jones, who started all 17 games for the Miami Dolphins last season, played over 91% of the defensive snaps. Despite allowing eight touchdowns in the last two seasons, he demonstrated competitiveness with 18 pass breakups and four interceptions. Standing at 5'10 3/4 and weighing 171 pounds, Jones was often utilized as the 'field' cornerback, minimizing his exposure to challenging matchups. His performance included being targeted at the second-lowest rate among cornerbacks with significant coverage snaps. The 49ers now have a robust cornerback lineup, including players like Renardo Green and Eli Apple, bolstering their chances for the upcoming season.