Ive never owned a Kelvin active but the the reason I say the Kelvin active and Kelvin lite are similar is due to the fact that the Kelvin lite has both primaloft hi-loft and polartec alpha. I think the Alpha is in side panels of the jacket.
Both have 80 grams of insulation. The primaloft hi-loft has a clo value of 0.65. I cant find a clo value for alpha but doubt it's a whole lot less. Primaloft gold and silver are the high warmth primaloft products with clo value of 0.92 and 0.78. Primaloft gold is comparatively really warm.
