Vionic Pep Solana - Women's modest block-stacked heel. Pep Solana's modest block-stacked heel lends stability as well as style to this warm-weather favorite. It features two straps across the vamp and ankle and easy hook-and-loop closures. Elevated Support with Vionic's Biomechanical Footbed. The footbed hugs the curves of your feet so you can take the day in stride and comfort.