i am looking into getting a 4.5mm farmer john. i may still opt for a 7mm, though. i have read mixed opinions on this. i have heard that 4 -5 mm is fine for all around, but 7mm is usually needed for the fall. i figure with the 4.5, i could just throw the aquaskin over the top for the the added warmth and windproofing. we'll see though.
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