* Super light weight IMEVA (injected foam) creates added comfort and flexibility. Midsole floats in case the shoe goes overboard without you. * Ribbed recovery insole massages your underfoot to stimulate blood flow, alleviating sore muscles and aiding in cramp prevention. * Engineered for breathability with air mesh toe box, tongue and heal. Collapsible heel conveniently allows for easy entry for all the lazy shoe wearers out there. Bungie creates a slipon form fitting upper that you never have to tie.