ASTRAL PFD Mens Sandals River/Water/Rafting/Kayak US 10/EU 。Webbing and adjustable straps from Astral award-winning PFDs (personal flotation devices) provide a secure, shoe-like fit 100% postconsumer recycled polyester webbing and canvas straps along with PFD-grade buckles provide exceptional strength Buckles are bluesign® approved Balanced Geometry™ roomy toe boxes and zero-drop Level Footbeds™ respect the foot\'s natural alignment and provide increased balance and ground feel Siped Flex Grip™ outsoles with G.ss Rubber™ use a low-durometer, proprietary compound that sticks and conforms to the ground while providing excellent abrasion resistance