Over the last thirty plus years these covers have been through hurricanes and tornados and not even one has ever blown off.
Instead of using several foam panels that will eventually wind up in some landfill, they designed Lightweight Swim Spa Covers that uses air chambers that don’t suck up moisture.
When you really want to get the best swimspa cover on the market you’re still better off with the swimspa cover custom made for your spa by SpaCap.com.