3/8
I usually go aloft on a single strand of 3/8" Sta-set (double braid) with jumars. I find 3/8 to be fat enough to feel comfy while being the skinniest I can easily grip and pull on. While I love regatta braid, and use it for almost everything on my boat, I find that it fattens up with age, so that my 7/16ths lines are fatter than new 1/2" sta-set.
Ben
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