Well, I wouldn't clip it. I hate those hoods you put on their heads, I think they are dangerous, and think it a bit unfair to remove their natural protection.
I personaly wouldn't, have done half, but never full if living out. Horses loose a lot of heat through their head just like humans and the hair provides some insulation. Imagine how much warmer you are with a hat on and as above, not a fan of the hoods for horses living out, too risky imo
I have a tb x cb mare and shes live out for the past 4 years this is the first year shes been in in the winter and ive always clipt her with a full hunter clip as i think the rugs and all the other gear that is in the market these days were able to keep our horses warm enough even when clipt out
Depends what clip I do - I wouldn't really full clip one living out unless it was really hariy and overweight, and still sweating. I'd do a max of a blanket clip and leave the face on from the bridle forwards.
Rugs are great for keeping them warm, but can rub much easier on something living out 24/7 with all the hair taken off (because they're always in the same rugs..).
I've had horses living out 24/7, still have one living out who's clipped, she has a blanket clip with half head off, and she's fine! Then again, she is a got horse and gallops round the field for fun!
I guess i'm a bit different as i don't compete mine and hack out with some light schooling but he's out 24/7, a warmblood and i don't clip him. Looks cute at first esp with his colour i think he's a slightly gingery mammoth but it keep him well and warm so i don't mind. The only ibts i trim are places like under chin etc for tacking up.
Mine normally has a hunter clipped (with 1/2 face) and winters out 24/7 no problem. I think as long as they have a cosy full neck rug on they're generally ok.
I half clip my NF face he grows very thick fur and gets very hot and sweaty, his head collars and bridles get very tight he face get so furry. I would not full clip his face though as I think the top part of their heads is more exposed to the rain and snow.
He does not wear any face hood thing and lives out and I do not clipped him beyond mid november so his face hair grows back quite a bit normally before the worst of the weather.
He has a neck bib and belly clip and lives out 24/7 in a very sheltered field which has a small woods in it. He is rugged appropriately and is the sort of pony who gets hot&fat easily.