Description ***Sitka&';s Standard Fit is designed to accommodate layering for added versatility across early to late season conditions. We recommend ordering this true to size.*** The Sitka Kelvin Pro Hooded Jacket delivers serious cold-weather insulation with complete wind protection for hunting, glassing, and long days on the water. WINDSTOPPERA(R) by GORE-TEX LABS blocks wind while remaining breathable, and body-mapped PrimaLoftA(R) Gold Insulation with Cross Core(TM) Technology places 133g through the torso and 100g in the sleeves and hood for high warmth with less bulk where mobility matters. High hand pockets, a secure single-adjust hood, stretch cuffs, an adjustable hem, and multiple internal storage pockets make it a dependable outer layer for harsh, windy conditions. Specs Material WINDSTOPPER Shell by GORE-TEX LABS Insulation Body-mapped PrimaLoftA(R) Gold Insulation with Cross Core(TM) Technology is extremely lightweight, breathable & stays warm even when wet Manufacturer Warranty Warrantied against manufacturer defects 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" XXX-Large 54" - 57" 38" How to Measure: Chest Measure around the fullest part of your chest, keeping the tape under your arms and across your shoulder blades. Sleeve Bend your elbow and place your hand on your hip. Measure from the center back of your neck, across your shoulder, down your arm, over the elbow, and to the wrist bone.