What is the difference between double-faced fleece and wool and which one is better?

What is the difference between double-faced fleece and wool and which one is better?
Structurally speaking, double-sided fleece is generally knitted and brushed. Wool is a woven structure. In terms of materials, double-sided fleece is generally polyester fiber, and wool is wool. In terms of thermal performance, wool will be relatively better, and in terms of cost performance, double-sided fleece will be better. Overall, the thermal performance is good.