Snickers 9169 D3O Ergo Craftsmen KneepadsThese specially designed ergonomic kneepads are perfect for everyday use by the tradesperson whose role involves very frequent kneeling. They are made from a unique material called D3O, which drastically improves the protection that these kneepads offer for your knee. D3O is soft and pliable until it experiences stress, at which point it hardens up, ideal for those times you drop to your knees a little too fast or happen to land on top of a pebble or