The Men’s button-up CATALYST Edge Long Sleeve Shirt from Mountain Hardwear shows us that flannel is still a classic for men’s outerwear. The traditional buffalo check features 100-percent brushed cotton from Japan that's midweight and sharp enough for a long day on the job followed by a pedal around town. The regular fit gives you plenty of room to move around without getting in the way. It’s the perfect weight and style to keep you warm as summer transitions into fall.