Polar fleece is:

• Soft, very comfortable to wear and are extremely warm even with a relatively thin layer of material.
• Has a rich texture and an attractive appearance.
• Hard wearing but lightweight
• It is seen by some as being environmentally friendly as it can be made from old plastic PET bottles.
• Easy to care, as it needs just a cool wash (30-40°C), line-dries quickly (certainly compared to wool),  no ironing required.
• It is a good alternative for those who are allergic or sensitive to wool.