The sponges are designed with EcoFoam technology to perfectly straighten your complexion. Each sponge is color-coded for use with formulas that counteract redness (mint), dark circles (pink), dullness (purple) and dark spots (peach). Apply a color-correcting concealer to the corresponding sponge. Roll, dab or gently gently over areas of discoloration: undereyes, nose, chin, acne and dark spots. The unique EcoFoam technology made from 70% plant-based materials.