Best For: Mild to Cold Conditions An all-time KUIU favorite, now with an antimicrobial odor resistant flannel lining. The Flannel Lined Insulated Snap Shirt delivers high-performance 3DeFX+ insulation—also found in our premium hunting jackets—into a clean, lightweight package that works as a mid-layer on the trail or a standalone piece around town. Warmth without the bulk and exceptional breathability keep you regulated and drier while you’re moving. Sleek quilted construction, thoughtful pocket placement, comfortable plaid flannel liner, and a remarkable warmth-to-weight ratio delivers 17.2 ounces of pure function.