Endo. K Insert Kneepad Details Add comfort and convenience to select 5.11 cargo pants with the Endo.K Insert Kneepad. The Endo.K measures approximately 6” x 9” and provides a ¼” thick neoprene cushioning layer that is perforated for breathability. Ergonomically shaped to move with you while a silicon print helps keep the kneepad in its place.