Zip-closure hip protectors are all about convenience—they're the easiest style to put on and take off, which is great if you struggle with pulling compression shorts over your legs or want quick access for bathroom breaks. The zipper typically runs along the front or side, making them much simpler to deal with in tight lodge bathrooms or cold parking lots.
However, there are trade-offs to consider. If the zipper sits right over your hip bone or along a seam that presses into you, it can create uncomfortable pressure points during a long day of skiing. Zippers are also a potential failure point—if the zipper breaks on the mountain, your protector becomes much less effective.
Zip closures work best for skiers who prioritize easy on/off over maximum stability. If you go this route, look for designs with the zipper offset from impact zones and a fabric flap covering the zipper track to prevent chafing.