These foams are compatible with Pelican’s Kayak Transport kit (PS0481-3). They are sold separately to allow you to replace only your foams instead of buying a complete kit again. They will allow you to transport safely your kayak or SUP. The pads are made of EVA. EVA is a very flexible and elastic component that offers better shock resistance when you travel with your kayak or SUP. EVA foams also have adhesive properties that ensure the pads stay in place on your car while you are driving. They also come with a additional anti-slip material that's provide better grip. Simply place them on the roof of your car and install your boat. This includes 1 soft foam pads of 22.7 x 3.4 inches (58 x 9 cm).