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Answer 2 is fine and suitable, though you may wish to check 'shooting (-) stick' in a good dictionary. It refers to a stick that converts into a seat (of sorts, at least propped into the ground to bear one's weight); such as one might use while out on a shooting-party ~ rather than that the stick, itself, were any kind of a weapon!
Answer 3 introduces 'their'; who are they? This doesn't quite make self-sufficient sense.
'Walking boots' (Answer 4) might help the problem of comfort in the open air, but hardly very directly.