Its a difficult weight. its between a medium and a heavy.a normal medium is about 200gm and a heavyweight starts at 350g and goes up. you will find it easier to get a 200g and a fleece. That will provide you with the warmth you want
My friends have just started up a mobile rug business and are selling Rhinegold rugs at BARGAIN prices. I know they can get hold of 300gsm stable rugs - prices are £32. They also a 4oz lightweight quilt at £25. If you are interested then please PM direct, as naturally I'm new on this forum and don't want to be accused of blatant advertising. I know they have CD available which they are sending out to people if you are interested in getting one from them. Their most expensive stable rug is £45.00.