I have a 14.1hh Welsh section D gelding and need to buy a winter turnout rug for him. He has a Masta rug but I find that it tends to cling to and pull back over his rump, slide behind his withers and pull on his shoulders even though the rug is not too big for him (it is 5' 9" in length). I am thinking of buying a high neck (not full neck) 1200 denier 300g+ rug, or may go for a full neck, rather than a removable one. I just wondered which make would be best for him? He is not particularly wide in the chest, his saddle is a 17" medium/wide. I would appreciate any advice...thanks.