Better Keep Your Cool! It's easy to keep your children cool with this sun filter that is custom designed for the Ergo Caboose. While this cover provides protection from UVA/AVB rays, it is also see-thru so your little ones won't miss any of the action around them. Parents love the Sun Filter because it keeps their children comfortable, is easy to install, and is easy to access the child without having to take the cover on and off. The Ergo Sun Filter is the Coolest stroller accessory on the market.