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I am going on a Ski trip with two days in the snow. Given that I am unlikely to go skiing again for a long time, I would like to minimise the amount of gear that I purchase. The minimum temperature appears to be about -2 or -3 degrees Celcius. How important is it to have thermal underwear? Is it something vital, or can I wear something else instead?

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Not an answer, but advice: I would try an used gear store for some of your other items to cut cost more. Our local one has tons of ski gear from people who "go once" and we're nowhere near ski country. – Russell Steen Jul 11 '12 at 13:06
-2 or -3 degrees Celsius or Fahrenheit? – Big General Jul 11 '12 at 15:39
@BigGeneral: Celcius – Casebash Jul 11 '12 at 22:59
Does the -2 or -3 include the wind chill ( ? – Amine Jul 12 '12 at 14:58
@Amine: Moderate winds apparently – Casebash Jul 12 '12 at 22:11

No, it's not vital to have thermal underwear. Layering is your friend.

During the winter months, I've been hitting the slopes regularly for the past 8 years or so. Though I do own thermal underwear, I've rarely had to use them. What I normally do is simply layer my clothes and then add/remove as needed to be comfortable. The downside to this approach is that, when it's really cold, wearing all of the clothes could get pretty bulky.

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I agree with this answer. With -3C as the minimum, thermal underwear would be nice to have, but it's not a must... especially if its just for two days. – Big General Jul 12 '12 at 1:48
What would you wear for the bottom layer then? – Casebash Jul 12 '12 at 2:35
For the bottom layer, I use my quick dry shirts which I normally use to run in during the summer months. – RonE Jul 17 '12 at 20:32

In winter your worse enemy is sweating. It is really hard to deal with it once you are sweating.

An appropriate thermal underwear will help evacuating sweating instead of retaining it. This been said, an appropriate winter jacket is also essential to keep you warm and also evacuate the sweating from the the internal layers.

It is not necessary to pay a lot to have a good thermal underwear.

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I have only ever used sweat pants. With a nice set of powder pants and regular pants, sweats underneath kept me warm down past -10© when I lived in Vail. This is good enough to keep the "layers" idea at play and also save money on "ski only" equipment. – BillyNair Jul 16 '12 at 21:20
@BillyNair: The OP did not answer my other questions concerning the type of skiing. Layering can be a valid answer for an advanced skier but I do not think it is a good one for a beginner. I have been doing winter activities for the last 8 years (temperature ranging from +5 to -25c without the wind effect). – Amine Jul 17 '12 at 13:58
I up voted your answer previously because I agree with you, and that is why I commented on your answer. If the OP was looking for a good answer yours was it I think, if they wanted something to use for the rest of the year when they are not skiing and they could also take skiing then I offer my option, but not ans an answer since I think yours is better. – BillyNair Jul 18 '12 at 2:13

If you don't have proper base layers, you may be regretful during that 15-20 slow lift ride while you're sitting in your own sweat. You do not need to buy base layers made by a ski/snowboard company to get the benefit. Also, it's not warmth that you get from this layer but a place to wick sweat away. I use my snow base layers as the coolest t-shirts I own in the summer.

Good luck and have fun!

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Good underwear is very important in winter conditions. When you're active, you're sweating. The moisture greatly reduces the termal isolation, which increases the chances of hipotermia.

Cotton is very bad for underwear, because it absorbs moisture. When it is wet, it acts like cool compress, draining the heat from your body.

Some people find cotton fine for them, but those are the people who sweat very little (I've noticed they drink a few, they have the first bottle of water half-full when I'm finishing the second etc.). But for most people, like for me, cotton is very bad as underwear in both summer and winter.

You don't need the underwear that have the label 'thermal'. You just need synthetic underwear, because synthetic fibers absorb little moisture and they get dry quickly. Wool is also said to be great, but I've never tried myself. It is told to scratch a lot ;)

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For extreme temperatures you are absolutely right, in fact, this was going to be my answer. In this case the OP only needs to get down to the upper 20s and not going to be too far from a lodge and their main focus is saving money on something they will only use sporadically. – BillyNair Jul 16 '12 at 21:23

I'm a warm-weather person. I absolutely do not function well, if at all, in cold temperatures. I would not fair well in the climate you spoke of. I would absolutely recommend at least getting a useful, yet cheap set of thermo-pants. I don't know exactly the price ranges but maybe these are ok?;

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