Although I currently focus on the Architecture market (lightweight tension fabric structures), 12 years ago while working at DuPont Tyvek, I partnered with Nike's Advanced Materials Group to develop an Andre Agassi Court Shoe made from Tyvek and a super lightweight foam. These are by far the lightest shoes I have ever put on. I think the laces are heavier than the entire shoe. Unfortunately the shoe never made it to market but I was lucky enough to get a pair in my size.
I've added these shoes to my portfolio because I think in some way, they are similar to Fabric Architecture, providing a lightweight solution with the use of unique, high-performance materials and a movement and freedom not found with traditional materials.
Maybe Nike will give them another shot someday.