Columbia Men's Midweight Stretch Long Sleeve Half-Zip Thermal Baselayer Top - Black, Size M

On a biting winter morning, a trail runner pulls on this Columbia Midweight Stretch Half-Zip before heading into the hills. The brushed interior traps heat while flatlock seams prevent chafing during high-output movement. The half-zip front vents excess warmth on steep climbs, and thumb holes keep sleeves anchored under gloves. This baselayer is built for skiers, hikers, and cold-weather athletes who demand warmth without bulk.

Key specifications

• Midweight thermal baselayer top for men
• Omni-Heat™ thermal reflective lining retains body heat
• Omni-Wick™ moisture management keeps skin dry
• 4-way comfort stretch fabric: 85% polyester, 15% elastane
• Active fit: close to body without restricting movement
• Half-zip front for adjustable ventilation
• Flatlock seams reduce irritation during activity
• Thumb holes in cuffs for secure hand coverage
• Color: Black; Size: M

Why choose it

Columbia's Omni-Heat™ technology reflects your own body heat back to you, so you stay warmer with less fabric. The midweight insulation strikes a balance between warmth and breathability, making it versatile for a range of cold conditions. The stretch fabric moves with you, and the half-zip lets you dump heat fast when you're working hard. Durable, quick-drying, and designed for layering, this top is a reliable foundation for winter adventures.

Ideal use cases

• Winter sports: skiing, snowboarding, snowshoeing
• Hiking and trekking in cold weather
• Running or cycling in chilly temperatures
• Everyday cold-weather layering under a jacket

Good to know

Care instructions: machine wash cold, tumble dry low. Do not use fabric softeners as they can impair the moisture-wicking and thermal-reflective properties. The thumb holes are designed to keep sleeves in place when layering, but they can be tucked inside if not needed. For best performance, wear as a base layer against the skin.