Why does Michael buble wear a blue wristband?

Michael Bublé wears a blue wristband to raise awareness for the fight against cancer, specifically in support of his son Noah, who was diagnosed with cancer in 2016. The wristband symbolizes hope and solidarity for those affected by the disease. Bublé has been vocal about his family's experience with cancer, and the wristband serves as a personal reminder of their journey and a way to encourage others to support cancer research and patients.