The conductor in these cables is made of copper or aluminium, while the insulation is dry, which makes them safer and more sustainable than those using fluid oil. The most commonly used materials are XLPE (cross-linked polyethylene) and EPR (ethylene-propylene rubber).

The three-core cable composition continues with an armour (mechanical protection) and outer sheath wires, both common to all three phases.

Once laid on the seabed, these cables are protected to avoid damage from external threats. Techniques like jetting (for sandy substrates), trenching (in rocky areas), concrete mattresses, or metal shells are used for this purpose.