Featuring an open mesh upper that sheds water, adjustable lace locks, and a non-absorbent tongue, this ultra-packable activity shoe is perfect for everything from paddle boarding to mud runs and anything in between. At just 7.5 ounces each for a men's size 9, the Aqua X Sport is designed with a breathable mesh upper with a quick-dry lining, non-absorbent tongue, and toe guard drain holes that help you quickly shed water, so it's barely any heavier wet than dry. A FAST, FINE-TUNED FIT. Get a comfortable, secured fit with the included speed laces. PROTECTION THAT FEELS JUST RIGHT. The Aqua X Sport uses the same flexible 5.5mm FeelTrue® sole and 3.5mm dual chevron lugs as the Mesa Trail, providing all-terrain traction and just the right amount of protection and ground feedback for responsive, natural movement through all the elements. If your feet don't feel as good at the end of the day as they did in the beginning, you haven't tried the Aqua X Sport. Life-changing comfort and superior performance come from letting your feet do what's natural – bend, move, flex and feel. All Xero Shoes feature a wide toe box that let your toes spread and relax, a non-elevated “zero drop” heel for proper posture, low-to-the-ground design for perfect balance and agility, and a flexible sole that gives you “just right” protection so you can Feel the World® as you move in total comfort.