68% and 95% confidence contours on the Ω_m − σ₈ parameter plane and the corresponding projected posterior distributions. Left: confidence contours from void counts (light blue) and void shape distortions (green, from Hamaus et al. 2020) of the BOSS DR12 voids, and their combination (black) as independent constraints. Right: comparison of the results from cosmic voids with other cosmological probes, cluster counts (purple, from Lesci et al. 2022) and the DES Y1 3 × 2 pt analysis (red, from Dark Energy Survey Collaboration 2018).