Here's what has emerged as our plan heading into winter.
1. Stable Sheet. Used sometimes as a straight sheet in the barn (40s-50s), or as a liner underneath a turnout sheet. Tristan's is a Tuff Rider brand stable sheet that I've owned for a few years but used primarily to keep him clean after baths until now. It's not the highest quality sheet ever and its a teensy bit small, but it does the job. Basically a previous style year version of this sheet.
3. Turnout sheet. Unlined, basic, waterproof turnout sheet to use as a top layer over the sheet and cooler above, or sometimes on its own on a rainy but warmer day. This particular sheet has the distinction of being the one I've owned the longest for him: I used to keep him at a place that had the most incredible clay deposits in their pastures, and all horses in that barn went out during mud season in turnout sheets. Otherwise you'd be currying dried clay off of them for an hour before you could ride. It's a Saxon that I've always really liked, actually, for all that it's a "cheap" sheet. Basically the older model of this sheet.
4. Stable Blanket. One of the two blankets my friend J. gave to me, this will enter the rotation when it's 30s overnight and during the day, under a turnout sheet. I have no idea what brand it is, but I like a few things about it: the cut back withers, the belly band (which you can't quite see in this photo), and actually the closed front - less to fiddle with, less bulk under another blanket.
5. Medium Weight Turnout Blanket. Used for temps below 30s, possibly combined with the stable blanket when it gets down to the teens. The other blanket J. gave me, this is a Weatherbeeta that is clearly showing its age. The straps - as you can see - are hanging on, and the edging is almost entirely gone. There are rips in the flannel lining. That said, this blanket has been hard used for many years and the fact that it's even still intact shows its class.
6. Heavy weight turnout blanket. Used for single digits and below. Depending on how he handles the winter, might double over the stable blanket when it really starts to dip below zero. This is the blanket he wore last year for single digits and lower. Another gift from a very generous friend, this is the Rider's International Heavyweight Turnout Blanket. As you can see, it's a great blanket but it swims on him a bit - it's a size too large, and the cut of the blanket is too long for his legs. Not the end of the world, but I would not buy this blanket new, even in the right size, because of the length against his legs.
So, there's the plan, anyway. What's your rotation for the winter?