Description GOHUNT Staff recommends ordering this piece true to size when worn as a mid-layer over a lightweight hoodie or vest and underneath a puffy jacket or rain gear. A cornerstone active insulation layer in any system, Sitka built the Ambient 100 hooded jacket with Primaloft Evolve to maximize breathability when you’re on the move and retain warmth once you’ve slowed you pace. With a durable 20D Ripstop nylon face, it holds up against thick brush, and a durable water repellent finish fends off light precipitation and prevents wetting out. With a full-zip front and hand pockets and a sculpted hood for a streamlined fit without obscuring vision, this piece is a must have for the hunter on the move in cool and cold weather. Sizing MEN'S SIZING GUIDE Jacket & Tops Sizing SIZE CHEST SLEEVE Medium 39 - 41" 34" Large 42 - 45" 35" Large Tall 42 - 45" 37" X-Large 46 - 49" 36" X-Large Tall 46 - 49" 38" XX-Large 50 - 53" 37" How to Take Your Measurements SLEEVE MEASUREMENT Bend your elbow and put your hand on your hip. Measure from the center of the back of your neck, along the shoulder, and down the elbow to the wrist bone. CHEST SIZE MEASUREMENT Take the measurement under the armpits, and around the fullest part of the chest and shoulder blades.   STANDARD FIT - Designed to accommodate layering for more versatility from early to late season climates. Specs Material 20D Ripstop nylon face fabric Insulation 100g Primaloft Evolve active insulation is soft, warm, and breathable Manufacturer Warranty Lifetime coverage for defects in workmanship or materials