RST TPU Knee Cup Insert for Tractech Leather Suits Engineered for precision protection, this TPU knee cup insert seamlessly integrates with RST Tractech leather suits to deliver enhanced impact resistance where it matters most. The thermoplastic urethane construction provides superior shock absorption and durability against abrasion, maintaining flexibility for natural movement on the bike. Designed as a direct replacement or upgrade component, it ensures your suit maintains optimal protective performance. Compatible exclusively with Tractech leather suit models, this insert represents a straightforward way to reinforce your existing gear without replacing the entire suit.