Good to read you guys’ opinions. I use several types of elastic laces for both racing and training and never thought twice about it. My preference are the bamboo laces with the ‘knots’ that allow you to ajust lace tension seperately for the different regions of your feet. Haven’t had any problems yet that i can link to the laces. That video made me wonder though, however the claims they make don’t seem to be supported by any scientific research or data from the medical field. Perhaps it’s just one of those things that’s differeny for every single person.