Feels like down, looks like down. The Insuloft Tech shorts are designed with an ultralight 15D outer fabric and DUROloft insulation, giving them an excellent warmth-to-weight ratio.
 
Composition
Shell: 100% Polyamide
Shell 2: 95% Polyester (recycled) 5% Elastane
Lining: 100% Polyester (recycled)
Fill: 100% Polyester (recycled)