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The PORTWEST B121 Thermal Trousers are designed to provide essential warmth and comfort when working in cold conditions. Ideal as a thermal base layer, these trousers trap body heat while allowing moisture to escape—helping you stay dry, warm, and comfortable throughout the workday.
With a close-fitting design and soft-touch finish, these thermals are perfect for layering under work trousers, overalls, or waterproofs. Lightweight and breathable, they support mobility without bulk and are suitable for both professional and leisure use in winter environments.
✅ Key Features:
Thermal long johns for cold weather work
Ideal as a lightweight, insulating base layer
Moisture-wicking to keep skin dry and warm
Soft-touch interior for next-to-skin comfort
Stretch fit allows full range of movement
Elasticated waistband for a secure, comfortable fit
Quick-dry and easy-care design for regular use
Minimal seam construction reduces chafing
Cold weather site work
Outdoor trades and logistics
Winter leisure or sports use
Underlayer for waterproof or work trousers
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