AllWISE colour-composite images of arc-like structures associated with (OB-type) stars in the Vel OB1 region. The star is identified with the white label (and a cross), and the infrared flux is represented by the heat colour scale. The white arrow shows the direction of the current proper motion of each star. The green arrow indicates the orientation of the wind bow shock, i.e. the direction from the star to the peak of the 22 μm emission. In ten cases (including HD 77581 / Vela X-1, Table A.2), the arc-like structure is well aligned with the direction of the proper motion, demonstrating that these structures relate to a wind bow shock (and confirming the runaway nature of the star).