ya but he is not 140lbs, he is 160. and growing.
If you want to be able to rip all mountain, and have lots of tail of landing huge go 179.
mouting +4 will give them a good park feel, and ski switch nicely. The larger size will give you more stablity at high speeds, and be better outside the park, and in the pow pow.
If your used to shorter skis, or really prefer shorter skis, the 169's will work too.
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