Greetings, I am sorry if this question has been asked and answered elsewhere in this forum. However, I have a need to feed my brain and I'm hoping you good folk can help me out. I am seeking to purchase a pair of USAF N1-B arctic mukluks and as I understand it, these were issued with two pairs of wool insoles and no liner. I am aware of the existance of the ECW liners (which are about as ergonomic as a cast I am told)however these were apparently issued seperately. My question/s is/are, how true to size do these boots run? Are they sized to accomodate a liner or should one order a size up? I wear a size 10 in a hiking boot and it would appear, depending on who you read, that I am at the cusp of a size large (9-10 US0 versus extra large (11-12 US). Would it be appropriate to size up in anticipation of adding a liner and go with the XL? I know that loose is better when it comes to winter clothing and footwear but while I approve of loose i abhor sloppy. Any of you folk have any insight or input to help me figure it out? Thank You!