C/B...it says it's urethane coated on the inside with seam sealer...this suit may work well in the colder weather months, but it will not for warmer weather. It will keep you dry, but because it's urethane coated the moisture from your body will not escape, so you will end up damp under the suit if you wear it for any length of time.
I'm a firm believer in layers. I do not have any heated gear, but have heated grips and seat. I have considered a heated vest or jacket liner, but have not gone there yet. My cold wet "system" is a base layer of wicking underwear, including boxer briefs and t-shirt. Over that goes wicking (Patagonia, in my case) long john top and bottoms, ski shirt that zips from chest up like a turtleneck, jeans of choice. If it's really cold, over that goes a Gore windproof layer of fleece on top, heavy leather chaps on bottom, and heavy leather jacket with vest thinsulate zip out liner (all my leather is Fox Creek). If it rains, I can pull off a layer, and replace it with the Gore-Tex rain gear, which keeps me dry and blocks the wind like the leather. Depending on the aniticpated weather for the trip, I can leave some at home, or have it all with me, and shed a layer as conditions warrant.
This is my system...a piece of heated gear would take the place of a couple of those. The fleece windproof jacket is very thin, but serves double duty as a jacket to wear when kicking around the parking lot at night when I get tired of wearing the heavy leather jacket.
Variations of this theme have worked for years when backpacking/skiing. Layers of comfortable, non absorbing garments enable me to get warmer or cooler, depending on how much I'm exerting myself, generating body heat. Works for me.
I just think a good Gore-Tex rain suit is a more versitile option, all things considered...otherwise you'll need something for hot weather rains, in addition to the cold weather suit.