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The PORTWEST B173 Dynamic Air Baselayer Top is a cutting-edge long sleeve thermal base layer, engineered for temperature regulation, breathability, and comfort in demanding work environments. Whether you're working in cold conditions or high-activity roles, this top keeps you warm, dry, and unrestricted throughout the day.
Featuring Dynamic Air fabric technology, it provides superior moisture-wicking performance while maintaining insulation and airflow. The soft-touch feel, stretch-fit construction, and seamless body mapping design deliver next-to-skin comfort with zero irritation—ideal for layering under workwear in winter or all-year-round versatility.
✅ Key Features:
Dynamic Air fabric balances insulation with breathability
Moisture-wicking technology keeps you dry and warm
Soft-touch material for next-to-skin comfort
Stretch-fit design allows full freedom of movement
Seamless body mapping construction minimises chafing
Long sleeve design perfect for layering under jackets or overalls
Lightweight and easy-care – ideal for daily use
Suitable for both cold weather and high-mobility tasks
High-activity site work or trades
Outdoor winter construction and logistics
Cold storage or variable temperature environments
Base layer under workwear or protective clothing
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