Working in the cold you have to worry about two things – staying warm and getting the job done. If your gear doesn t let you bend, reach and move, you won t get it done on time. The PolarForce Jacket isn t just for keeping you warm it is designed to keep you productive and your performance high. The new Performance-Flex feature on the elbows, back, and under arms keeps this subzero rated coat flexible so movement isn t hindered. Grip Assist on the sleeves helps you get a better grip on items you have to carry or move, and with over 500 grams of insulating power, the PolarForce Jacket will keep you warm down to -40°F. The PolarForce Jacket is a powerhouse that can t be stopped. Just like you. Sizing Instructions: For the most accurate fit, take your measurements over the base layer of clothing you intend to wear with this RefrigiWear gear (such as thermal underwear, jeans or a sweatshirt) and refer to the size chart for this product.