His delts are so huge they cause the sleeves to fold inwards. Unfortuantely they also cause him to have 2.5x the earth's gravitational pull.
I think it's just something he does. Ever notice Dirk pulling the neck on his jersey up all the time. It's just a habit.
He is so soft that the material of the uniform makes it too hard for him to lift his arms unless folded in.
I guess it has something to do with comfort. Sometimes when i play, i do the same if i feel the jersey/shirt is kinda tight on the shoulders. Besides, if it helps him preserve that solid jumpshot, then i have no qualms about it. :grin:
I've only seen girls do this with their Sports jerseys; they fold it under their bra straps. This just adds to PPat's softness.