Buff and Shine 6” Grip Foam Pads have quality hook & loop material for fast easy pad loading with a strong adhesive that prevents delaminating. Made of 100% high strength reticulated foam. In other words, the cells are open; this allows air to flow through the foam. Chemical compounds and polishes require the right amount of air flow through the foam. Open cell foam is ideal for this process to succeed. Not only is closed cell foam not ideal, it is weaker structurally.