Men's Thermoactive T-Shirt 4F M165 Blue 4FWAW24USEAM165 33S S/M

Hit the trail, the gym, or the pavement in the 4F Men's Thermoactive T-Shirt M165. Built for athletes who push through cold mornings and high-output sessions, this blue short-sleeve base layer combines thermal regulation with active moisture management. The athletic fit and stretch fabric move with you, while flatlock seams prevent chafing during repetitive motion.

Key specifications

• Material: 92% polyester, 8% elastane
• Thermoactive fabric with thermal insulation
• Moisture-wicking and quick-drying
• Breathable construction for temperature control
• Round neck, short sleeves
• Flatlock seams for anti-chafing comfort
• Odor control technology
• Machine washable
• Colour: Blue
• Size: S/M

Why choose it

The 4F M165 is more than a base layer—it's a performance tool. The polyester-elastane blend offers four-way stretch for unrestricted movement, while the thermoactive fabric traps body heat when you need it and releases excess warmth as you heat up. Quick-drying properties keep you comfortable during interval training, and the anti-odor finish means you can wear it for back-to-back workouts without worry.

Ideal use cases

• Running in cool weather
• High-intensity gym sessions
• Layering under a jacket for outdoor sports
• Cycling or hiking in variable conditions
• Year-round training as a standalone top in mild temperatures

Good to know

Care is simple: machine wash cold, tumble dry low, no bleach, no iron, no dry clean. The athletic fit is true to size; if you prefer a looser cut, consider sizing up. Pair with the 4F thermoactive leggings for a complete thermal base layer system.