tldr; Custom fit liner. Fills voids perfectly. Premium upgrade.
Check pricesEach axis shows what % of Reddit comments are positive about that topic. Higher = more praise.
Best praise vs top criticism for Masterfit Zipfit Liner
“they generally advertise the width of the last which is a good starting point beyond that everyone's bones are a little different, all the liners are slightly different, etc I just got zip fit so hopefully I don't have to worry about this as much anymore”
“I have been down that road in forums too. ZipFit Liners are undoubtedly colder than Intuition Liners. I know that because I have fit 1000's of Intuition Liners over the last 20 years. I have had to put very few of those clients in heated socks or heated footbeds to stay warm. I have been fitting ZipFit Liners for 5 years now (I would guess ~200-300 clients), and I have put a lot of those people in heated socks or footbeds. The percentages are not even close.”
286 Reddit opinions analyzed • Last updated 4/5/2026