Ride Aquazero Skull Cap
The Ride Aquazero Skull Cap is different from most in that it has a water-repellent band around the forehead to provide extra protection from the elements. That band is also wind-resistant.
The rest of the skull cap – the red stuff – is a Super Roubaix fabric so it provides loads of warmth. The black fabric is AcquaZero (there's a 'c' in there, although Ride don't use it), a material that used to be exclusive to Santini but no longer is.