]I favored the ISPLR a few years ago after conducting research, but the project didn't come off.
This and a survival suit and a 2/4 man raft is prudent.
Wearing a life vest as well as the ISPLR shouldn't be ruled out but it would be a squeeze for a large bloke in the back of a R44 wearing suit, raft and vest.
Beaufort defence make the SEIE MK10, an assembly comprises a submarine escape and immersion suit, an inner thermal liner, and a gas inflated single seat liferaft, all contained in an outer protective stowage valise.
When I last enquired they showed a little interest in doing a one off single place raft....without the integrated escape suit!
Mickjoebill
File:Submarine Escape Immersion Equipment suit.gif - Wikipedia, the free encyclopedia