Something like the mil issued to 341 pilots
I'm still using mine! The green cover wore through so I've changed that a few times but the cushion still works a treat. I still remember going to some RAF base to be measured up for it. As I have never known a helicopter with a comfy seat I have used it in many types since and in a 212 I needed that and a sheepskin bum cushion! :-) Still using it in a 139.