Though some ninjutsu researchers believed that mizugumo(water spider) were wore on the feet, Hatsumi Sensei made a video about their use in the 60s. https://www.youtube.com/watch?v=MEV1dDrvbVg Over the years, Cummins made a big deal about mizugumo, calling Fujita Seiko's ninja knowledge into question based on this which is daft considering Seiko probably knew more about the ninja and ninjutsu than Antony will ever know. Cummins even posted a video showing old European(German methinks) images of a similar device to back up his belief that it was a seated flotation device. I can't find those videos now, but here is one where he discusses the water spider. https://www.youtube.com/watch?v=6Jxs9oBeJBY Had Antony done his research, he would've known that Hatsumi sensei knew about this before he was born instead of thinking that he was making any groundbreaking discoveries. Typical of Westerners who don't know the culture they claim to research. SAD!