Replying to Thermoflex Boot Liner Question

I have a pair of krypton rampages from probably 2008 or something and theyre the best boots ive ever owned. The only problem is last year I noticed my feet started to get cold as fuck so I need to look into a new liner.

I found a raichle thermoflex liner which says its the original intuiton liner. so my first question is, is this a good liner for typical park use? another thing is my boots are a 25.5 and the liner only comes in full sizes so my second question is, is the 25.0 supposed to be used for both 25.0 and 25.5?
i figure people will say go to a bootfitter but the price is so good online, thats not really an option. Any help is greatly appreciated so hopefully i can swag these for christmas and be nice and toasty on the slopes once again