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A Guestroad 75 miles cross country in one day in warm weather with leggings. Did not bother me - but did puff out and look puffy. The small might have been better. I am 5' 11' and 183 lbs.
Fell many times going up slow up hard rocky climbs. No pain in knees. Fell right on knee sometimes. Very amazing fearless feeling.
I am intermediate so I fall a lot still