Hanes Men's Cotton, Moisture-Wicking Crew Tee Undershirts, $15 @ Amazon
These Hanes Cotton Crew Tees are soft, breathable, and designed to keep you cool all day—whether you're relaxing at home or heading out for errands. With their classic fit and dependable comfort, they're the undershirts you'll reach for again and again. Get a pack for just $15 at Amazon.