How long do hard shell knee pads last?

The rigid shell itself is very durable and can last many seasons with proper care. However, the inner padding compresses over time (typically 2-4 seasons of regular use), the straps and buckles can degrade from UV exposure and cold, and the inner liner wears from friction and sweat. Replace pads when the inner padding feels noticeably compressed, when straps lose elasticity, or after any significant impact that may have compromised the shell's structural integrity. Race skiers who take regular gate strikes should inspect shells frequently and may need replacement more often.