Saw this on the BBC news site just now:
http://www.bbc.co.uk/news/technology-22885602
would be great for getting to the top of downhill sections (apart from the bulk of the fan units of course!)
http://www.bbc.co.uk/news/technology-22885602
would be great for getting to the top of downhill sections (apart from the bulk of the fan units of course!)