There is some controversy about this: https://www.outsideonline.com/2392896/trek-wavecel-helmet-controversy https://www.outsideonline.com/2392896/trek-wavecel-h

There is some controversy about this: https://www.outsideonline.com/2392896/trek-wavecel-helmet-controversy https://www.outsideonline.com/2392896/trek-wavecel-helmet-co... Also, some people argue that MIPS is probably not as effective in real life as in tests because people simply don't fasten helmets tight enough for it to matter (and the same may apply to these helmets with respect to shear forces), but I don't know if this has been scientifically tested.