Description GOHUNT Staff recommends ordering this piece true to size when worn as a mid-layer over a lightweight hoodie and underneath a puffy jacket or rain gear. The Sitka Ambient 100 Vest is Sitka's flagship active insulation piece, distilled down to a full-zip vest. Built with Primaloft Evolve, this vest provides unparalleled breathability when on the move without sacrificing core warmth once you’ve slowed your pace. The 20D ripstop outer will stand up to trails that wander through thick brush and the durable water repellent finish sheds light rain and snow. Zippered hand and chest pockets quickly stash your possibles. 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 Weight 7.8oz 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