muc off expanding microcell spongeMuc off Expanding Microcell Sponge Muc Offs Microcell expanding sponge is contoured to an ergonomic shape for maximum comfort and ease of use. Weve also vacuum packed it to take up less space and to use less packaging materials. Dont worry though, once youve opened our perfectly pink sponge, it expands into an easy to use, bike and wheel friendly size! Fordele: Compact Ergonomic shape for maximum comfort and ease of use Vacuum packed