A dry-clutch DCT runs its clutches in air; a wet-clutch DCT runs them in the gearbox oil, which carries heat away. A dry unit can overheat with repeated stop-start launches on steep slopes, which is why Kia's manual warns against holding the car on a hill with the accelerator; a wet unit copes better with heat and higher torque. If you drive mostly in stop-start traffic, ask which type a car uses.