I've purchased various different Zoic liners, and compared them also with the ones that came with my Fox, Endura, and Pearl Izumi mountain biking shorts. While I found the least expensive Zoic Essential liner to be lacking (in flexibility and comfort of the chamois pad), I have been very happy with Zoic's higher end liners. I haven't carefully contrasted the Premium, Ultra, and Carbon liners, but they are all much nicer than the Essential. I also prefer them to the basic liners from Pearl Izumi (worst), Endura (tight around my thighs at their bottom), and Fox (most comfortable basic non-Zoic liners). I've purchased Zoic liners for my son, and they work for him as well. He wears a small, and I wear a large; Zoic's size chart seems accurate enough, so I didn't dare to try a medium, even though that's my size in some other brands; so in doubt, size up.
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