The Yes 420 Powderhull is a stiff board designed for challenging lines in deep powder on the steep and remote terrain and is also a good carver on the piste. The 420 Powderhull steers directly and delivers great lines in the powder and solid carves on the slopes, also when you're not constantly charging the slopes.
The longer tip of the board gives the Yes 420 Powderhull great float in the powder.
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Yes says about the 420 Powderhull
How to ride powder without back leg burn. The narrower outline of the 420 with PH allows such extreme versatility - a wide range of riders can be comfortable on this one length. Refined waist width and sidecut make it more responsive than the 420, while longer effective edge gets a little more bite into the hardpack. And the PowderHull makes it impossible to sink the nose.