From Vionic:

Tide II features the same great Orthaheel Technology and fit you’ve come to love and expect! This iconic, best-selling style now features leather trim and an updated tread pattern.

• Proven to effectively alleviate heel pain.*
• Soft woven toe post and foam-lined strap ensure a comfortable fit.
• Orthaheel Technology is biomechanically designed to hug your arches and support your feet in comfort. Vionic sandals’ built-in orthotic is shown to be effective in helping to treat heel pain (plantar fasciitis).
• Lightweight, flexible medium-density EVA midsole absorbs shock, reducing stress on feet, ankles and knees.
• Durable TPR outsole with patterned tread helps improve traction.
• Woven/leather uppers with padded neoprene upper liner.
• Recommended by Dr. Andrew Weil.
• Received APMA Seal of Acceptance.