Pete_Hickey said:So, back to the original question, I'd say that a pound on the foot is like a pound on the back on a good trail, but on a rough trail, a pound on the foot may be like 5 pounds on the back.
Sure, if all things are equal. But they aren't.
The rockier the terrain is, the more I need/want a solid sole under my feet that resists folding when I step on a rock. If I try to use sneakers or similar, I'm generally lame on the 2nd day. I've heard lots of AT thru hikers make similar comments after they get through PA and then the Whites.
Sadly the only way I can get this degree of rigidity under foot (especially with my size 48 feet) is by going with heavier boots. It used to be that the only option was 1/2 shank norwegian welted boots with thick leather mid soles (think Limmer, Fabiano or similar). Now it seems that some modern injection welted boots using nylon/plastic shanks can provide this stiffness at a fraction of the weight.
Given 2 boots with similar stiffness I'll definitely take the lighter ones. But, given a choice between a light but non-supportive boot and a heavy but supportive one, I'll take the latter.