Men's thermal active trousers 4F M236 deep black 4FWAW25USEAM236 20S S/M

On a frosty morning trail run or during an intense winter training session, these 4F men's thermoactive pants keep you warm, dry, and focused. The deep black base layer fits snugly under your outerwear, wicking sweat away from your skin while providing moderate thermal insulation. The slim, elastic waistband and flatlock seams ensure all-day comfort without chafing, so you can push through every rep, stride, or climb.

Key specifications

• Material: Polyester and elastane blend for stretch and durability
• Moisture management: 4F Dry technology wicks sweat and dries quickly
• Thermal insulation: Moderate warmth for cold-weather activities
• Fit: Slim fit with elastic waistband and flatlock seams
• Colour: Deep black
• Size: S/M
• Intended use: Base layer for training, winter sports, and outdoor activities

Why choose it

These pants are engineered for active men who demand performance in chilly conditions. The breathable fabric allows excess heat to escape, preventing overheating during high-output efforts. Flatlock seams lie flat against your skin, reducing irritation even during long sessions. The polyester-elastane blend offers four-way stretch, so you can move freely without restriction. Whether you're layering under ski pants or wearing them solo for a cool-weather run, they deliver reliable comfort.

Ideal use cases

• Winter running and cycling as a base layer
• Cross-country skiing and snowshoeing
• Gym training in cold environments
• Hiking and mountaineering under shell pants
• Everyday cold-weather wear

Good to know

Care instructions: machine wash cold with like colours, do not bleach, tumble dry low, do not iron, do not dry clean. The 4F Dry technology ensures quick drying after washing, so they are ready for your next workout. The slim fit allows easy layering without bulk, and the elastic waistband provides a secure, comfortable fit. These pants are part of the 4F M236 collection, designed for all-season use but particularly suited to cold weather.