: It is designed to function as both a standalone outer layer in mild conditions and an insulating mid-layer under a waterproof shell for extreme cold.
: Unlike traditional down, which clumps and loses warmth when wet, ThermoBall's small synthetic fiber clusters maintain their shape and loft even in rain or snow. buy north face thermoball jacket
: The "Eco" versions are made from 100% recycled materials , including the insulation and shell fabric. Which Model Should You Buy? : It is designed to function as both