I am 23 years old and am from Iceland, planning a trip to the USA with a friend. We are both below 25 years of age and I have been to the USA about 16 times give or take, all as a visitor; vacation purposes.
I know that there are companies that rent cars to people aged 21 and older rather than 25, but have heard that there is more to it than that, something about insurance companies not wanting to cover foreign people under 25 years of age I believe?
Essentially what I am asking is, are there any additional requirements as a foreigner below 25 to rent a car in the USA?