The Winter Interactive Long Sleeve Base Layer is the warmest Assos long sleeve base layer. It accomplishes this by supplementing the SPC.07 fabric with the same warm, thick material proven to be so successful in Assos' previous generation frigid-weather base layer -- the Powerstatic Plus. The Winter Interactive has the same zippered, high-neck construction as the earlyWinter Interactive base layer. This neckline, plus the arm pits and backs of arms are made solely of SPC.07. The rest of the Winter Interactive is made from heavier, more-insulating fabric.
Assos suggests that you use the winter Interactive Long Sleeve Base Layer in conjunction with their airJack or fuguJack jackets, depending on the temperature. Assos recommends the Winter for temperatures ranging from 32-46 degrees. Available in sizes Small-TIR, in Black only.
One final note: Assos base layers are not specific to men or women. They are designed to be unisex.