The MAC Magic Extension Mascara (£20) may just be the closest thing you'll get to lash extensions in a tube. The volumising and lengthening formula contains five millimetre-long synthetic fibres, which are some of the longest on the market (on average, lengthening fibres in other mascaras are 1.5 or 2 millimetres long). The mascara features a cone-shaped brush that makes it easy to comb through lashes and catch every itty-bitty lash hair.