ok so I love making gadgets for my worldbuilding.

and my newest idea was this.

in cold planets in order to help preserve heat and lower the energy required to heat someone in the field they would wear a snowsuit that connects via tubes to their helmet and using 2 one way gates you get air intake from the outside into your lungs while the hot air you spew out gets directed into your suit helping preserve your body heat.

the design likely uses strips of silicone like material for the intake and a lightweight metal plate for the outtake.

and both open and close based on the airflow generated by your breathing.

Idk I like developing shii.

Mango.