Check out this review in the Raising Rippers blog on Outside Magazine Online:

Family Gear Test: Bomber Shade for your Boat 

From the review:

"The Sombrero was a game-changer for us: super-rugged construction that easily withstood gusty winds and generous dimensions—ours was six feet long and five feet wide—that shaded practically the entire boat, so we didn’t have to cower together to stay cool. Never has rafting with two tiny children felt so luxurious and civilized."