Description of Chaco Flips 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 NEW EcoTread™ outsole is made from 25% recycled rubber, reducing Chaco's impact on the environment. EcoTread™ is available in charcoal and chocolate to complement the new midsole colors. Available on Zong, Hipthong and Wrapsody styles. Features: EcoTread outsole BioCentric footbed