The Penguin Feet rack pads are easily the coolest and highest quality rack pads on the market. The Flat Feet pads are built to fit around aero or factory cross bars. Look at the Round Feet rack pads if you have round or square style cross bars.  Here are the details:

• 30" - some of the widest rack pads on the market.
• Long Lasting closed cell foam that won't disintegrate over time.
• Durable Neoprene cover that is soft to the touch and easy on your gear.
• Velcro closure from end to end to keep your Flat Feet securely on the crossbar.
• Mesh bag with loop closure to store your rack pads when not in use