The Tacks lineup is all about maximum coverage and optimal protection and the Ultra Tacks elbow pads definitely delivers with the introduction of D3O foam technology. This innovative foam is built into the Ultra Tacks JDP elbow caps to help provide better shock absorption against both hard and soft impacts. So how does it all work? D3O smart foam keeps its soft consistency to absorb energy from low intensity impacts and instantly hardens for any higher intensity impacts. The molecules in this foam are continuously free flowing, this allows the “smart material” to remain soft and flexible, but on impact, the molecules lock together to absorb and dissipate the energy from the impact. After the impact, the molecules return to their soft and flexible state. This unique molecular structure offers cutting edge pro level protection perfect for warding off stick slashes, and protecting the wearer from big hits.