actually, I think you should avoid as many plastics in your products as possible. Because plastic goes into the water, every time it's washed....that means more micro plastics in the eco system. I bought some "merino" ski socks for the kids and realised that they have only a minor percentage of actual wool in them. Unfortunately have already unpacked, but will not buy again in the future. I just can't believe nobody is talking about the micro plastic pollution clothing companies are creating everywhere. I am always looking for natural materials, and it would be nice if things that don't really need plastic fibres (winter hats etc) could be done with 100% natural fibres...