Let’s not beat around the bush—your vagina needs to breathe. Synthetic materials, even if they’re mesh and seem breathable, can make you sweat and trap odors. That’s basically a one-two punch for funk. Especially on hot days, when you’re going to the gym or if you’ve noticed a recent change in the way you smell, stick to cotton undies, or at least a pair with a cotton crotch.

READ MORE: What’s Your Vagina Supposed to Smell Like?