How much do you weigh and how hard do you ski? Might be the question if you relay need the 18. The freeflex 17 and the new peak 18 have the same toe but Tyrolia changed the heall this past year they no longer pivot and are lighter the 18 have metal toe wings. The 15 have a metal heal housing for the spring, I forgot about that, the toes however has some plastic in it. I know the 18 have better retention than the 15 I have come out of the 15 in a odd situation, If you are heaver and charge hard get the 18 if you are light get the 15, check
www.backcountry.com to see if they know the weight.
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