To answer my own question, yes a 6'4" man can fit just fine in a ridge runner. I wouldnt want to be much taller, but its a good fit! Im a back sleeper, and find it very comfortable! I can sort of lay on my side---not a fetal position, but sort of a laying on the side with the knees partially brought up. I can lay on my stomach, but at my height it doesnt work very well---when I bring my hands over my head, they hit the end of the hammock! So, Im pretty happy with this hammock---the quality is top notch, and it feels great! I designed and built a grizz bridge last year---its definitely a distant relative, but branden worked some of his famous warbonnet magic and made the ridge runner much better! (no idea how he did it, but its really really good!)