How to Stop Being Cold Outside: The No-BS Guide to Winter WarmthSHARE ONWe independently evaluate all recommended products and services. We at Iron Snail Industries have created what we like to call the winter jacket selection system. Synthetic is usually polyester because polyester absorbs virtually no water, so it will just wick moisture away and then dry really, really fast. The stuff that’s happening, aerogel being implemented into jackets – I think eventually winter jackets are going to be foam. The Iron Snail Winter Jacket Selection System: How to Choose Your Perfect JacketOkay, so let’s go over the winter jacket selection system – how, with all this information, to pick out a winter jacket that you will love.