BWT's eye-catching pink has featured on Team Silverstone cars since the 2017 season and BWT will again use its brand to convey an important message in 2021.
The rear of Sebastian's crash helmet carries the message "change the world, sip by sip", highlighting the importance of reducing the unnecessary transport of water bottles, in turn lowering the worldwide emission of CO2, in combination with a push to reduce the use of disposable plastic bottles.
BWT and Sebastian will begin their partnership by converting kindergarten and schools into “BWT Bottle Free Zones”, enabling thousands of children to enjoy healthy and sustainable drinking water.
BWT's CMO Lutz Hübner said: “With Sebastian, we were able to find the ideal ambassador who perfectly represents our mission – to make the world a little bit better, sip by sip.
The future is important and we must do our best to protect the planet for children and young people. We all share this responsibility and if we come together we can make a difference.
“Sebastian is not only an outstanding athlete but above all a great person with principles, a clear opinion and civil courage.
“Together with him, we are going to make a lasting contribution to the preservation of our planet.”
Sebastian added: "The future is important and we must do our best to protect the planet for children and young people. We all share this responsibility and if we come together we can make a difference.
"As a Formula 1 driver, I think it’s right to speak up on this subject and have my voice heard. I am pleased to have found a partner in BWT that shares the same perspective and goals.
"By cutting down the amount of plastic waste, we can make the world a little better, sip by sip."