Polar fleece is used in jackets, hats, sweaters, sweatpants, cloth nappies, gym clothes, hoodies, blankets, and high-performance outdoor clothing. It can be made partially from recycled plastic bottles and is very light, soft, and easy to wash. Polar fleece can stretch one way but not as much the other.
Berners-Lee reckons the average greenhouse gas footprint of polar fleece in manufacturing carpets at 5.55 kg CO2 equivalent per kilo, when produced in Europe. This gives it almost the same carbon footprint as wool, but with greater durability.
When fleece goes through the laundry, it generates microplastics which become part of domestic waste water. Municipal waste water systems often discharge into rivers and oceans.PET does not biodegrade and suspended microplastics are easily ingested by marine life, thus entering the food chain.