It turns out poor laundry habits can wreak havoc on your clothes, and according to Drew Westervelt, founder of hypoallergenic laundry detergent HEX Performance, the cardinal rule of washing clothes is one that’s regularly broken by even the most adept laundry pros. “Never ever use fabric softener,” he says. “Regular fabric softeners were not made for today’s workout clothes.” The reason for this is because most workout clothes are now made with synthetics, a new type of fabric that’s not well-suited to harsh softeners. Instead, Westervelt suggests ditching your bottle of fabric softener in favor or a fabric booster that’s better suited for moisture-wicking synthetics like sports bras. Another way to ensure your undergarments last well beyond the duration of your gym membership is to wash them in a mesh lingerie bag ($9; amazon.com). “Sports bras are probably your most durable bras, but they can still use a little care when machine washing,” Westervelt says. Rather than tossing your bras in the wash alongside everyday t-shirts, leggings and jeans, clean sporty delicates in a separate bag on a washing machine’s gentle cycle. If you’re concerned about inevitable wear and tear, opt for hand washing, and air dry your sports bras when possible. “Unless you plan to wear your sports bra in the 30 minutes after washing, air dry it,” Westervelt says. “Sports bras dry quickly, so just grab it out of the wash and lay flat to dry.”