Not a pilot but there is a company called Green Leopard (you will have to google it) that have a number of distributors in the UK. They have a huge range of 'injection moulded' earplugs. Originally aimed at motorcyclists and shooters but they certainly make sleeping in the back of a C17/C130 much more pleasant (fortunately, we only have to work one leg of an aeromed trip - but we don't have a slip crew in theatre!
Good luck
Bob