Core warmth is key when opposing weather changes your hunting situation. The Sitka Fahrenheit Vest is a windproof mid-layer that features lightweight Primaloft Silver Down Blend insulation with a WINDSTOPPER membrane. The cut is slim enough to wear under heavier layers, but the woven polyester rip stops face fabric is tough enough to stand alone. No-Cold-Spot quilting keeps the heat evenly distributed and down insulation in place.