i like to use a makeup brush to apply my foundation and finish with a sponge, so i wont have any streaks and keeps the finish dewy (i dont use matte foundation). If i just use a sponge, it soaks up all the foundation (im too lazy to soak a sponge every time in the bathroom).
Or i just use a cushion sponge! those are much easier and faster to clean and wont soak up the foundation.