yes the shape will fit fit fine its the length of the strap that is an issue, smith found an iteresting way to correct this problem and make money at the same time, its called a helmet helper and itv extends the strap to be big enough to fit a helmet, you can google it cuz they dont have the helmet helper here

I wear my Smith Heiress goggles with my Giro Helmet (M) and I have not had any problems. They both work really well together!