Given the nature of the review process on this one I think it would have been incredibly difficult to accurately test more than 4 pieces under similar circumstances. Sure we'd all like to see more pieces included but I value the process on this one is much more than the number of pieces tested. I think it gives you a good mix of midlayer types and how they perform. Find a similar layer that has the features you like from whatever brand and it's likely to perform similarly to those tested depending on the fabric characteristics you go for. Waffle fleece, vs. hard face fleece, etc.
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