GPA are mostly for people with rounder heads samshields are good too but are a bit "longer" you can see the difference when trying them :)
Never tried a GPA but love my new Miss Shield!!❤️❤️
I have a Samshield which fits my round head! Absolutely love it
I have both and they both fit my head but gpa fits it better
I know that Charles Owen just came out with a line of helmets specifically designed for round heads, so maybe try those
I have a round head and could not wear Charles Owen they just don't fit so I bought a samsheild and I love it !!