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I have only climbed in the aluminum caps, tried the old school leather, only made it up 10 feet, far too painful, I dont understand how the other climber wears them 6 hours straight.
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I have some Caddy pads at work. They give me a pressure point that is uncomfortable. I hate them, actually, along with the long tree spurs.
I have my personally owned leather L pads, all worn out, and they conform right to my shins. Zero discomfort. Pole spikes. Less leverage. Love 'em, even for thick barked trees, though I climb with a climbline and flipline, so I don't worry about spurring out. Though, I've really only spurred out once or twice in 4 years of climbing.
In part, its gonna be the shape of your legs in conjunction with the shape of the pads.
Try to try someone's before you buy.