David Beckham flaunted his new green wrist band in an Instagram video. The former England football captain wears the "Together Band" for a cause. He is the new ambassador for the UN's global goal.

"It's a silly thing to say but our kids are the future. I'm very lucky to live in a city, in a country that the kids can have a great meal, they can drink fresh water, they can look after themselves and we're very fortunate that we have that," said David Beckham. In the video, he was promoting his new gig and explained why he got involved in the campaign.

The 44-year-old said that he wanted his children to understand that they live in luxury and are very fortunate. "But other kids around the world don't and I will continue to fight for that," he said. The "Together Band" campaign is an initiative launched by sustainable fashion brand Bottletop.

Outlander's Caitriona Balfe, Alessandra Ambrosio and Doutzen Kroes are other celebrity ambassadors involved in the campaign. Each band has a different colour that represents one of the 17 UN Global Goals, set in 2015. The UN had set a route map for a healthier and more sustainable planet by 2030.

David Beckham has chosen to support Goal 3, that is "Health and Well-being." The bands are priced at 20 pounds and 35 pounds, and are available for purchase at www.togetherband.org. Each pack contains a set of two bands, one to wear and one to share to help spread the word and show support for the goal.

David Beckham
David Beckham stars in a cameo role in Guy Ritchie's King Arthur:Legend Of The Sword Reuters

Beckham has shared his #Together Bands with his eldest son, Brooklyn Beckham and friend LeBron James. The proceeds from the sale of these eponymous Together Bands or bracelets go towards funding "life-changing projects to build a better future for us all" as well as spreading awareness about the issues. These bands are made from recycled ocean plastic and re-purposed illegal firearm metal.