Currently I have an old pair of Irish Setter 800 gram thinsulate boots (I think they're around 10 years old). They are starting to smell pretty bad and may leak a bit. So I need to buy a new pair of boots. Any advice on what brand and style to buy? I'm normally a size 11.5 and my boots are size 12. Should I buy a larger size this time? I've noticed that heavier socks make my feet colder so I have just been using Wigwam Polypropylene sock liners. While my feet stay warmer they still do get cold in temps below 35. Should I buy a larger size this time? I plan on switching to Merino wool socks this year by the way.