Even though it's technically still summer, it's never too early to start purchasing sweaters. Since it's still warm during the day and cool at night, it can be tough to decide what to wear. That's where stylish, lightweight sweaters come in. To save you time, we compiled the best options available at Amazon, starting at only $10! Although we love oversized, cozy sweaters, now's the time to opt for lightweight styles made from breathable fabrics. We found picks that appeal to all styles, including cropped cardigans, effortless pullovers and more.