uniqlo heat tech for skiing?
I was at Keystone and A-basin over Christmas.
I think it would depend on what else you're wearing (like how warm your jacket is), and if you easily feel cold.
I felt really cold as the ski lifts took me to the tops of runs. Not moving felt cold. Tops of mountains felt cold. Night skiing felt cold.
I was in Columbia mid-weight baselayers, a North Face shell pant, and a pretty substantial Burton thinsulate jacket. I wouldn't have worn less. But I feel cold pretty easily.
Heat Tech is pretty thin for really cold weather base layers. That said, it seems comparable to other more outdoorsy brand's products of comparable weight in terms of warmth. So for standing around in the cold, pretty good stuff.
BUT I don't know how well they perform when slightly damp from sweat. If you try the stuff and find out, I'd love to know.
Seirus makes quality stuff.
My perspective is cross country skiing, cycling and running.
I forgot; I wore a fleece in addition to my insulating shell jacket.
Have something that covers your head, your face, a shell on top and bottom, at least a good insulating layer on top (like fleece or wool), and your uniqlo base layers, good gloves and socks, and you should be fine. (I'd do a thicker base layer on the bottom, or add an insulating layer to a thin base layer. But, I'm really sensitive to cold.) Keystone has a gondola that takes you to the top of a number of runs, so if you only ski there, you won't feel the cold or wind from sitting in a lift. It's a really nice feature. Have fun!
What do you currently have so that we can give you more specific advice?
Forecast for Summit County next week is highs in 30s. Night skiing at Keystone will probably be in 20s.
Ideally, I'd suggest an outer water resistant layer--either a shell or soft-shell, a mid-layer (e.g. fleece jacket or wool sweater), and an insulating base layer. Uniqlo heat-tech should be fine for the top. I usually like something thicker for my bottoms--my legs are usually warm when I ski, so I usually just ski in mid- or heavy-weight underwear bottoms or running tights under shell pants.
Nothing wrong with down as a mid-layer (though it could be too warm) but as an outer layer, if it gets wet it won't insulate. Cashmere will work as well, but I wouldn't wear my nice cashmere skiing.
If you ski with a helmet (strongly advised), your head will be warm.
A common misconception is to ski with overly thick socks or two pairs of socks. This can cut off the circulation to your feet and make them cold. I ski with thin liner socks in a close-fitting boot and my feet stay warm above 15F.
Jacket - 1. westbeach sub79 10k mm waterproof/10k gm breathability snowboard jacket
2. North End excursion soft shell jacket 8000mm waterproof/ 800g breathability
Pants - 1. Smarty 686 detacheable lining waterproof snowboard pants
2. Skigear pants waterproof coated
Midlayers - 1. Columbia omni therm stretch turtleneck fleech
2. a couple of polyester dry-fit long sleeves
3. a made in scotland cashmere sweater that i dont mind getting dirty
4. a couple of other uniqlo fleece zip up jackets,
5. a columbia down vest
Goggles - spy + dcp goggles
Gloves - Celtek Clan leather gloves
i have no socks for skiing, anything else i should consider buying?
thanks in advance
Looks like you have plenty of gear. The lined pants plus a base layer should be fine for the legs. Don't know the gloves but should be easy to get a pair at the resort if for some reason they're not warm enough.