If you can do the 1200d the Horze Avalanche Supreme are really nice blankets. My Paint gelding is quite narrow in front. Years ago I found some nice turnout blankets that fit perfectly. They were discontinued. Pretty much everything else I tried didn’t fit properly so his shoulders were getting soaked. I contacted the store where I bought the original batch and she suggested the Avalanche Supreme which she was using on her own horses. I was skeptical when I looked at them online, but saw them at Equine Affaire and got a set with rain sheet, medium and heavy. I found a medium with a hood on sale last year which I use for very cold or heavy snowstorms.
The biggest advantage is the design of the high neck. They have a triangular gusset sewn in that extends over the withers. It doesn’t sit on the withers so they don’t rub. High necks on most sheets are just an extension of the fabric without any curve along the topline. There are two sets of double T buckles on the front with a lot of adjustability. The tail flap is huge. They have plenty of length for larger horses. They are very well made. My horse is on pasture board and is on his third winter in them. It looks to me like the Avalanche Supreme are made by another company and Horze has the US franchise.
The biggest problem I find is the water resistance on any brand. When they are out all the time it weathers, but doesn’t leak; the lining stays dry. I sent them out to a shop that launders and waterproofs them. They came back like new, including Velcro that was totally cleaned out.
I use a rain sheet below about 50 because my horse is 25 and doesn’t put on extra pounds. I don’t want him soaked to the skin and shivering. At 60 I would worry that it is too warm for a lining and she would get overheated. .