"Cold technology" is a gas injection system that offers considerable benefits in terms of inflation speed, volumes attained and product safety in comparison with other previous technologies (Pyrotechnic Inflater / Hybrid Pyrotechnic / Heated Gas) and was therefore adopted by car manufacturers for airbags.
It is known as "cold technology" because the gas to be compressed and injected must be cooled to reach its liquid form: once the airbag is deployed, the gas is allowed to escape and expands to its gaseous state.