Us Weekly has affiliate partnerships. We receive compensation when you click on a link and make a purchase. Learn more! Sandal season isn’t over just yet, and Leslie Mann has convinced Us to style a pair with a year-round staple. The Spa Weekend star is winding down summer in black slip-on sandals, and the slightly thicker outsoles are a unique touch to stand out from other options. Luckily, the simple silhouette isn’t tough to copy, so we found a comfortable lookalike. Mann was recently spotted in New York City looking the definition of a cool mom. Her outfit’s base was a feminine white blouse and relaxed jeans — both of which deserve a…