The unique shape and exclusive material available only with beautyblender ensures impeccable, streak-free application with minimum product waste. Use it with primers, foundations, powders, cream blushes, and any other complexion product. Beautyblender features an open cell structure that fills with small amounts of water when wet. This allows the sponge to be 'full' so that the makeup product sits on top of the sponge rather than being absorbed, allowing you to use less product every time. When wet, the beautyblender doubles in size and becomes even softer, ing to its original size when it air dries.