The torso area is exposed without a lining

There's a hem and waist drawstring so you can really help insulate yourself in cold windy weather

Having said that

5 years of active combat service outside of the US

German Flag Patches

US Army Air Force WW2 Ike Jacket Battle Dress - 38R Shirt The torso area is exposedAt a glance 100% Wool Body Material 2 Button Chest Pockets & 2 Internal Slit Pockets Button & Popper Front Closure 7 Golden Chevron Overseas Service Bars 9th Air Force Sleeve Patch Staff Sergeant Rank Patches "MUC" Meritorious Unit Citation Award Patch "Raptured Duck" Honourable Discharge Patch US Air Force Corps Enlisted Men Collar Lapel Discs Side Waist Adjusters Button Cuffs Iconic WW2 Kit, Ideal for Reenactors or Collectors Shoulder Epaulettes