Do you mean the shires ones??
Assuming you do am not sure TBH.The general opinion is that they must be rubbish as they're cheap and that the gullet idea can't possibly work.
Having said that though I know of a few people that use them and rave about them and their horses certainly don't seem uncomfortable in them.
They *shouldn't* be any good,but proof of the pudding and all that,who knows:unsure: