This is the Regulator to wear for maximum warmth. It's warmer than heavyweight fleece, far more compressible and weighsless. Throw it on as outerwear in mild conditions or as a midlayer when the temperature drops. Details: Activist stretch panels in critical flex areas (sides, inside elbows and wrists), adjustable drawcorded waist to seal out snow, zippered pockets to shelter cold hands, clean-finished seams for comfort. Sized for a trim fit. Made in USA. M's Regulator R3 Radiant Jackets