Ideal blanket weight for a young, "hot running", Arab?

I'm thinking about continuing to foster Lady through the winter and one of the things the rescue requires for winter care is blanketing when the weather is really bad.
If they didn't require it, I really probably would not get her a blanket. She's young, keeps herself warm well, why does she need a blanket? But it's required so hrmph.

So, I'm not sure what "weight" of blanket to get her. My old girl has an entire arsenal of blankets, one for every weather condition, practically!
Lady won't be so lucky. Lady is only getting one blanket for when it appears like she needs something more.
She seems to do an excellent job of heating herself - after a bath, she's 100% dry in under 20 minutes while Lacey'll be still pretty damp after 45. After a rainstorm, she'll be nearly immediately dry - Lacey takes longer.
Anyway, I'm thinking that she'll probably be one of "those" that gets sweaty easily.

About the coldest our winters ever get is 15*F for about a week each winter (the time when she would likely be blanketed), then things get warmer. The average winter temperature is around 38-45*F.
We do get plenty of rain but there are many trees, as well as a large easily accessible shelter, to get dry under.


I'm thinking that a medium weight will do the trick, and maybe a cheap fleece cooler for layering in case she gets really cold on those "super cold" days?
Or, since I'm going to only be blanketing her when it's really cold, is a HW really the way to go?

I would just let her use some of Lacey's blankets but there's a 10 inch blanket size difference between them...somehow I don't think that'll work out well.

Thanks! :)

I'd go with a medium (waterproof if she's going to stay out) and have an inexpensive fleece liner that you could use as a wind breaker if it's cold and dry but not cold enough.

All I have are midweights and turnout sheets and liners, I layer accordingly to the weather (and I'm in Minnesota!). You should be fine with what you have!

Schneiders has some nice deals on blankets right now for an off season sale, I would hit them up. I have several of their fleece liners as well, as they have the belly band wrap which I really like for laying and for putting on as a cooler in the trailer when I haul my mare back and forth for lessons in the winter. I do keep a can of StaticGuard on hand because my horse hates the static cling/shocks of the polar fleece.

I'd go with the medium weight waterproof one (that's what I have - Saxon medium weight for 5 winters already), or just a waterproof turn-out sheet (to protect from the wind and rain).

Thanks! I appreciate the help.

I was actually planning to buy from Schneiders, great minds and all that, I guess!