Longer lifespan when sanding wood and paint! The sanding sponge ensures even pressure on the surface. Sometimes there is no alternative to hand sanding. The problem was that conventional sanding sheets wore out quickly when sanding curves and edges. They often became clogged or broke. The only solution was to buy many sanding sheets, leading to high consumption and a lot of waste. Today, there are sanding foams with Bosch Surface Structure. A wide, extra flexible sanding sponge, ideal for contour sanding on all surface shapes. The Bosch EXPERT S473 Flex sanding pad is a revolution in hand sanding. Once you've used it, you'll never want to use anything else. Strong, flexible bonding of the sanding grains with the foam thanks to Bosch Surface Structure.