Description of Chaco Flips - Women's The most minimalist Chaco to date: a thoughtfully executed redesign of the essential summertime sandal. Flips offer foot cradling BioCentric™ support and 25% recycled EcoTread™ outsoles. The EcoTread™ outsole is made from 25% recycled rubber, reducing our impact on the environment. EcoTread™ is available in charcoal and chocolate to complement our new midsole colors. Available on Zong, Hipthong and Wrapsody styles. Features: EcoTread footbed BioCentric support Soft polyester webbing