Everyone needs that brush to apply their make up perfectly! I think the Sigma Flat Kabuki - F80 is great and does just that. You can have the best foundation, but if you haven't got the tools, you might as well not have a great foundation right? This brush costs around £19.50, it is defoo worth it if you want that flawless finish. I would normally use this brush to apply my liquid foundation and I think its the best makeup brush I've used so far.