This won't be for everyone, but thought it's still worth getting it out here.
Indeed there are many other brands, some cheap and nasty and others more lux. I chose these as a few colleagues own a pair and they mentioned that they're happy.
From the website:
100% recycled. 100% soft.
Introducing our game-changing GreenThreads™ fabric. This revolutionary high-performance fibre was exclusively designed for our healthwear range, crafted from recycled plastic bottles and coffee grounds. Whether you're a style enthusiast, or simply someone who cares about the planet, our GreenThreads™ fabric is designed to make you feel great while making a positive impact.
Thanks I was just looking at new scrubs last night.