The ULTRAZ is the only jacket I have been using this winter. I have relocated to Central Oregon and my wardrobe needed an update for the colder temperatures. I am mostly using this for gravel and trail riding in temperatures from 25-45 F. I have varied the base layers with as little as a CRAFT FUSEKNIT, to the decade old Assos heavy winter base layer, both with zipper necks, and additionally a summer base layer. The neck of the ULTRAZ is large enough to accommodate turtle neck layering without constricting the throat.
Which brings me to the built in face protector. In all of these temperatures I have been wearing an open top, full head protector, with a FuguHelm cap. The built in is connected by 2 1/2 inches of material at the back label, so pulling it up to cover the head up to the FuguHelm leaves a considerable gap for cold air at the base of the neck. So my solution is a full head protector and using the built-in to fill the neck or pulling it up over the face as needed. I have ridden in light precipitation on wet gravel roads and I am kept comfortable and dry. Enough so, I can zip down for temperature control. That said, in these temperatures my feet get cold first, even while wearing winter boots. My core is fully protected and has not gotten cold.
The jacket material sheds moisture and blocks wind to my satisfaction. In mid 30s temperatures, I met 25mph wind gusts, and the only entry seemed to be at the junction of the neck and zipper. The waistband, stretchier in the back, is snug enough to prevent wind from entering from the bottom, and I will add, so are the wrist cuffs. The 1 3/8 inch elastic cuffs are perfect for the gloves I am using.
The 3 rear pockets are easy to access. The internal pocket "lid", 2 3/4 inches deep, made of a mesh material, can work to keep you iPhone secure if it is standing upright. Winter spray will enter the pockets so waterproof protection if you choose. The only thing this jacket is missing is a zippered pocket, but it is not enough to rate this jacket less than 5 stars.
This jacket is distinctly, two layers. The outer soft-shell and the inner fleece. On my dirtiest rides I have washed the jacket, taking care to dry the outside for a bit before turning it inside out on the hanger in order to dry the inner fleece layer overnight. I have also, wiped off the dirt spray with good results. This jacket has added to the number of days I am riding outside. I purchased the Blackseries and I like the graphics and overall look.