It's all fine as long as your clothes are reused, even into rags. The very flexible microfibers probably are not a hazard on the level of microplastics. Edit:

It's all fine as long as your clothes are reused, even into rags. The very flexible microfibers probably are not a hazard on the level of microplastics. Edit: they actually do pose this exact problem, though the filter in washing machine is supposed to catch all that. It doesn't.