Nitro.

Pouring hard out of the bottle, Milk Stout Nitro cascades beautifully, building a tight, thick head like hard whipped cream. The aroma is of brown sugar and vanilla cream, with hints of roasted coffee. The pillowy head coats your upper lip and its creaminess entices your palate. Initial roasty, mocha flavors rise up, with slight hop & roast bitterness in the finish. The rest is pure bliss of milk chocolate fullness.

More at Left Hand Brewing.