1, eiderdown pants have better warmth retention than cotton pants. Down is star-shaped, and each filament is fish-scale under a magnifying glass. This structure has a large number of micropores, which can store a large number of still air, effectively prevent the conduction of heat, make the concrete sink and have better thermal insulation. Cotton trousers also have warmth, but the gap is smaller and the heat dissipation is faster, which is not as warm as down trousers.

2. Moreover, down trousers can provide a better warm effect, which is suitable for indoor and outdoor activities, while cotton trousers are only suitable for indoor work or activities, which is not as practical as down trousers, so down trousers keep warm.