Crotch: Jack’s Dry Goods Friction-Free Powder ($18)
Tight underwear, rigorous workouts, and late-summer heat can combine to create a real stink-sauna in your pants. Jack Black’s (no, not the rotund guy in movies) Performance Remedy product includes pure corn starch for moisture absorption, green tea to reduce bacteria and inflamation, cucumber to keep you from scratching, and lavender and chamomile to soothe and “calm” skin. Bonus: It works on the rest of your body too.