Have got 3 Features 2x L and a medium. The tape measure says my head is 61-62 cm but the medium Feature still fits. The chinstrap join is right under my ears and cradle is on one of the lower settings but the adjuster is not maxed out and the shell itself is quite a good fit. The size Ls fit easily there is room to spare on the cradle and the straps and in colder weather i can wear a buff with them whereas the medium would be too snug.
In comparison with an Enduromatic the Feature is defnitely more oval shaped. If I try a L Enduromatic with the thinnest pads it only touches my head at the front and back