Wally
Some helicopters such as the 212 have the floats that inflate on entering the water, if armed of course. Some like the 350 may have the inflate button on the centre console, not too easy to reach if you're in a hurry! I always liked the fixed floats on the 206, at least you knew they were inflated! Having had 2 engine failures on take off, making a decent EOL was all I had to do.