Zip-closure gloves are all about convenience. If you've ever struggled yanking gloves on and off—especially with cold, stiff fingers or a bulky liner underneath—a zip makes entry and exit much easier. They're also handy for spring skiing or variable conditions because you can crack the zipper open to vent heat without taking the glove off entirely.
The trade-off is that zippers add a potential failure point. If the zipper jams or breaks, you lose that secure closure. They also aren't the best seal against deep powder; even water-resistant zips can let moisture sneak in compared to a cinched drawcord or Velcro strap. If you're charging through chest-deep snow, look elsewhere.
Zip closures shine for resort riders in mixed conditions, skiers who want easy on/off, or anyone whose hands run warm and appreciates the venting option. Just check that the zipper is well-protected by a storm flap to keep moisture out.