It doesnt follow the leg. What am I doing wrong?
It's because vertices of toes part of the mesh have weight 0 or little above. The easiest way to fix it will be: Select the mesh, go to Edit mode, select vertices, that makes toes part, Select Toe.L vertex group in Vertex Groups and click on Assign. It can make the weight to sharp though, so if that will be the case, select Toe.L in Weight Paint mode (basically exactly how it's on the image), press W and choose Assign Automatic from Bones.