Studless Or Studdable What Makes A Winter Tire Studdable Or Studless?

What makes a winter tire studdable or studless? - studless or studdable

I am looking for winter tires for a Pontiac Grand Am 2003 ... Options to the performance classes in the winter, the blocks of ice and snow, winter studdable vans and SUVs, the blocks of ice and snow. I am not concerned with cosmetics than when I slip in Ohio during the winter in my sport tires!