What kind of blanket do i need for winter??

I need to find a blanket for my guy to wear this winter (will probably start blanketing him very soon as its getting chilly). He's a touch underweight at the moment, and don't want him shivering off all his calories- please no comments on him being underweight, it cannot be helped :).
My problem, is that I've never blanketed before, and I am confused by all the different styles, fill types, etc. I have no idea what to even look for. Right now it's getting around 0 C at night, and up to 10 during the day. During winter, it can get as cold as -40 (horses usually stay inside after -25 though). He seems to be growing a pretty decent winter coat at the moment, but I think he's going to need a bit of extra help this year.
What type of blanket should I be looking for? I've checked online, and see things that say # denier outer shell, # nylon filling, # grams polyfill, etc etc etc... But I have no idea what it means! Very confusing!
If anyone can point me in the right direction, it would be much appreciated.
Thanks!
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Denier is the strength, bigger the number stronger it is. I prefer 1200 denier.

Fill is the warmth in grams. 100-150g= light, 200-250g= medium and 300g+= heavy.

Each horse is different in what they will need but this is what I'm doing.

My mare is a hard keeper and could use a few more pounds. It is currently down anywhere from the teens to the 20s and 30s at night, in fahrenheit of course. She gets her medium at night then naked during the day. Once it drops into the single digits she will get her heavy and then depending on daytime temps either naked or the medium weight.

She lives outside 24/7 but I will put her in a stall if it is really raining but too warm for her blanket or when it gets to -40 this winter.

Thanks for the info :). I was thinking about blanketing him at night only until the day temps start to drop to around 0, then blanket him 24\7 until it warms up again. The only blankets I could find were 200-250 of filling- do you think they'd be ok from 0 to -20ish?
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So you are doing celcius correct? So -20c is only -4 fahrenheit, which 250g fill should be plenty.

I'm using my mares midweight right now and our temps are already at 0 celcius at night if not below.

Just check to make sure he isn't too hot or too cold under the blanket.

You can always get a wool liner of sorts to put under if it gets too cold with just the midweight.

Yes, I'm going my Celsius- I suck at the whole conversion thingy :P. Thanks for all the great info. I hate blanketing, as I love when they look like giant poofballs, and my friends horse was badly injured when he got caught up in his blanket, but if he needs it, he needs it. He's in individual turnout, with nothing to get caught on, and then stalled at night, so hopefully there won't be any issues.
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Just make sure it is fitted correctly. If it is too large that is when they can get tangled in it. My horse runs around like a butthead with her blanket on but I check the straps everyday to make sure all is working and properly adjusted.

Also if you take the blanket off during the day and he already has a good coat he should stay fluffy.

Sorry, I got that wrong, the one's I've been able to find were 300-350 grams of filling, which seems like a bit much. I'll have to keep looking- maybe I'll find a sale online :).
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Where are you located that uses celcius but doesn't get to cold?

I'm in Canada :). It can get to -40 during the winter, but the horse's are usually kept inside after -25 unless its sunny and not windy.
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Oh jeez my girl would be inside most of the winter then lol. I'd try a midweight and see how he does with that. Just make sure he doesn't sweat. That is more dangerous.
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