Here is what saga writes about the jacket:
"The Monarch 3-Layer Jacket is built from a rugged twill fabric. The tricot backing features a marbled Flux Yellow pattern, a subtle detail of the custom laminate construction. This shell is storm-proof, featuring a best in class waterproof/breathable SAGA-Tek™ membrane. This is our most packable jacket."
Tek Specs
SAGA-Tek™ 3L fabric with 20,000MM waterproof/20,000G breathability
100% Bemis seam-sealed
Custom tricot backing
YKK AquaGuard® waterproof zippers
Oversized chest pockets for extra storage
Jacket to Bib-Pant integration
Removable storm skirt
