Heres a flexible source of extra insulation that does the job without weighing you down

Perfect for high-pulse activities in changeable weather conditions. Its made from a super lightweight and tear-resistant recycled shell fabric, and insulated with a hydrophobic goose down that stays dry for up to 10,000 minutes with exposure to wet conditions. It comes equipped with two zippered hand pockets and reflective elements for safety.

Made from Pertex Quantum, a super lightweight and tear-resistant recycled shell fabric
Insulated with RDS certified hydrophobic
H down platinum 800 CUIN fillpower down 2 zippered hand pockets Reflective elements for safety
Contains bluesign approved fabric

Materials:
Climatic Rugged, one of our most rugged four-way stretch fabrics.
A double weave with a soft backing towards skin; 60% recycled polyamide, 30% polyamide, 10% elastane, 202 g/m, bluesign approved.