The Proof 72-Hour Merino T-Shirt is just $58 during this sale, which lasts through Monday. It’s received around 700 five-star ratings from customers and has a nearly perfect review score.

Right now, Amazon is selling Real Essentials Men's Dry-Fit Long Sleeve Shirts with Sun Protection (4 Pack) for $35. That's 30% off the original list price of $50.