Well, I ditched the two single suction-cup models (kept falling off every 30 minutes or so), and tried the dual suction-cup models. They hold for about 4 hours at the helm, and about 1 hour back where they get salt spray. Time to go go 2" or 3" wide velcro. I'm tired of washing coke and beer off the sole and out the scuppers---especially if it was a Sam Adams!!!!