Charlie and Harry are kite buggying along the north east coast of Brazil, from Natal to Jericoacoara. It's about 1000km powered purely by wind. Until June 2011, we've never kite buggied. As far as we know, this has never been attempted in South America. It will be an unofficial record for the longest kite buggy trip without vehicle support.

But we're not asking for your donation without offering something in return...

We've got a home and family to support us and the means to take a month off work. But of course there are others our age who don't. So we thought we'd use publicity from this trip to raise funds for Centrepoint, a charity who help homeless young people.

In this day and age of marathons and other challenges, we all get loads of requests for charity donations. We didn't want to join the long line without offering something in return. So we thought we'd do things a little differently...

Give over £80 and we'll kite buggy naked. There will be video/photo evidence (don't worry, we'll fuzz out the relevant areas!)

Give over £50 and you can ask us to buggy for a whole day wearing just speedos, sleep rough, or leap frog the whole width of a beach. Any other requests, put them with your donation in the comments!

Give over £25 and we'll send you a postcard from Brasil. Pictures of thongs optional.

Give over £8 and we'll tag you in our facebook video about the adventure, making you look both generous and exceedingly cool.

For every £100 we'll also do an extra blog post or video blog.

It's simple, fast, and safe to donate - just giving send your money straight to Centrepoint.

Please donate now! :)

Thank you,

Harry and Charlie Thuillier