Long-lasting cushion comfort is ensured in the women's Vionic Bella II Sandal. Made with a smart EVA midsole that reduces foot fatigue and pain throughout your knees and ankles. The Vionic Bella II Sandal offers a biomechanical orthotic footbed and a deep heel cup for plush support and enhanced stability. The rubber outsole is constructed with a grip texture for advanced traction protection and durability on a variety of sufaces. EVA midsole Biomechanical orthotic footbed Deep heel cup Rubber grip outsole Multi-surface traction protection. Scientifically Proven to Alleviate Heel Pain* *Based on a peer-reviewed clinical study partially funded by Vionic on people experiencing moderate, non-traumatic heel pain. Vionic contoured sandals were shown to be comparable in effectiveness to Vionic orthotic inserts. Support Technology:.