Bontrager Ballista MIPS sizing? Compared to Synthe?

Just barely fit a Medium Giro Synthe that has done its duty and needs replacing due to crashe(s). Looking at Bontrager’s Ballista MIPS. Anyone know how they fit? Thanks. David K.

Just barely fit as it was almost too small?

FWIW, I’m a borderline medium/large in helmets. I had a bontrager ballista size medium and it fit good and I tried on a giro synthe medium and it would barely fit on my head.

Great info. Thanks. Yes, the medium Synthe fit correctly but it was a tight fit. I feel pretty good about getting a medium Ballista now. David K

Ditto, a Medium Synthe is tight but a Medium Ballista is a comfy fit. FWIW, I have a more “oval” head which doesn’t jive well with Giro’s seemingly rounder shape.