A hybrid or adjustable cuff is designed to give you the best of both worlds. These gloves have a cuff that can be worn over your jacket sleeve like a gauntlet or tucked inside it like an under-cuff style, usually with an adjustable closure that lets you dial in the fit either way.
This makes them a solid choice if you ride in variable conditions or ski all over the mountain. On a deep powder day, you can wear them over your sleeve for maximum snow protection. On a mild resort day, you can tuck them under for a cleaner, low-profile feel. They're also great if you switch between different jackets with varying cuff designs.
The main trade-off is that hybrid cuffs may not seal out snow quite as effectively as a dedicated gauntlet, and they won't feel quite as streamlined as a true under-cuff glove. But for most all-mountain skiers who see a bit of everything, that versatility is worth the small compromise.