Chaco's essential summertime Flip offers exceptional support for relaxed, take everywhere comfort. ChaPU polyurethane midsole for durable support and comfort. Contoured Addstride footbed for lasting arch support and body alignment. Ecotread rubber soles lightweight, earth aware all purpose traction. Water ready webbing straps promote active use with durable wear. Heel risers increase lateral stability. Sculpted heel cup centers the foots natural shock absorbing pad under the heel. Aggressive arch support controls pronation. Outsoles have 25% recycled content. 1.5 2 mm lugs with high surface contact lugs.