The 3/4 length allows extra toe room in tighter fitting shoes. "Closed cell" system helps reduce friction and side-to-side forces which cause blistering of the skin Helps prevent blisters and calluses.
"Closed cell" system won't flatten out Helps cushion and absorb shock. Helps maximize energy return. Helps protect the heel, arch and mid foot area gives greater foot support and stability. Helps keep foot from rolling inward.