HELMET

A helmet is provided including a helmet shell for spatially defining a head receiving space and an adjustable ventilation arrangement which is in flow-connection with the head receiving space. The ventilation arrangement includes at least one first ventilation device having at least one first ventilation channel running in the helmet shell and a first slider device, which is assigned to the at least one first ventilation channel and which for varying a flow cross section of the at least one first ventilation channel is displaceable between a ventilation channel opening position and a ventilation channel closing position along the helmet shell. The at least one first ventilation device moreover includes a first latching device for latching the first slider device to secure it in at least one predefined latched position.