I'll answer my own question! I called Marmot Warranty/repair dept., not their customer service reps... as they don't have this info. These are actual garment measurements..... Large followed by XL.Chest 51"/54". Sleeves ....37.5/38.5 Neck 23.5/24.5 Center-back length 29"/30"The jacket has 4 oz sq/yd Primaloft in the body, 3 oz sq/yd in the sleeves and 1.8oz sq/yd in the hood.I would call this the "Medium" warmth category for winter jackets. Having a multitude of Primaloft Jackets....Marmot and EMS.... the 4 oz weight PL in the body gives it noticeably more warmth than 3 oz alone. Having a bunch of Primaloft jackets..... this is not for severe cold... like -10 or anything....... but depending on the users activity level, metabolism and all.... should be OK for anywhere from above zero to 40 plus degrees. I find Primaloft jackets to have a wider temp range than down..... making good for 3 seasons here in the Midwest. For severe cold I layer different Primaloft jackets ..... warmer than any down parka! I've got a Marmot Belay Parka that has 7 oz PL in the body... and combined with a lighter PL layer.... it's a furnace. Wearing a PL vest over/under the Ellsworth will make for a very warm jacket.