Don't let perfect be the enemy of good. They acknowledge there are always trade offs and costs. Their goal is to find the option that does the least harm.

Plus they're actively working on the microplastics problem: https://www.patagonia.com/blog/2017/02/an-update-on-microfib...

In regards to their product, they make high quality clothing that lasts longer (reducing consumption) and sheds less.