Can anyone recommend an ultra-thin/light fly rug for a horse who suffers with the bugs but is also very hot so I want the lightest possible to avoid making him hotter/sweaty?
The premier equine 'super lite' fly rugs are fantastic, and are by far the lightest I've found - the ones with waterproof tops can get warm in summer but the standard ones are so ridiculously light - the material is very fine and I have never found them to heat a horse up. Surprisingly durable too for something so thin, when I first tried it I couldn't imagine it lasting long but I'm in my second/third(?) year of it now and there are no snags or signs of it wearing out. They keep their shape really well too - I prefer the cross surcingle rug to the belly flap version though as they seem to stay put better if you have an active type who chases about a lot. I've been really impressed with them and wouldn't buy another sort after finding these.
I recently bought one of the cheap Derby House ones and I have to say, it's been great! Really lightweight fabric but has stood up nicely to some rough and tumble in the field. They're on sale today for £20 and I'll be ordering a spare so he's got one to wash and wear.