Hey Stephanie! The Cascadia 16 has the most stability out of our trail styles through the use of the Ballistic Rock Shield which is designed to adapt to uneven terrain. Our footwear team determined that the type of support offered in Road styles is not appropriate for the trails. When you're on the roads, the GuideRails on our Road styles deliver a consistent level of support with each stride. But when you're on the trails, your foot is landing differently each time with the varied terrain.