The Thule 480 Traverse Foot Pack is the solution for cars and pickup truck cabs that have smooth, naked rooftops with no rain gutters, no factory side rails, no factory racks etc. Packaged as a set of four Feet it replaces the Thule 400XT Aero Foot Pack with a host of new features and benefits. Requires 2 Thule square load bars and 4 Thule Traverse Fit Kit Clips to complete a full rack. Purchasing just the set of four Thule 480 Traverse Foot Pack is a great way to transfer your existing Thule base roof rack system to a new vehicle cheaply without the need to buy an entirely new base rack system. We highly recommend a four pack of Thule Locks (not included) to lock each Foot to vehicle.