Why do hard shell pads need to slide on snow? Isn't that dangerous?

Sliding on snow is actually a safety feature, not a danger. In a high-speed crash, a soft shell pad can catch on the snow surface, causing the pad to twist or the leg to torque, potentially creating ligament injuries from rotational forces. A hard shell slides cleanly, allowing the skier to decelerate naturally without sudden rotational forces on the knee joint. This is why hard shell pads are preferred for high-speed disciplines where crash dynamics matter.