Size Guide
Size guide description
Size | Collar | Chest |
---|---|---|
S | 14.5" | 36" |
M | 15.5" | 40" |
L | 16.5" | 42" |
XL | 17.5" | 44" |
2XL | 18.5" | 46" |
3XL | 19.5" | 50" |
4XL | 21" | 54" |


Guardian Thermal Elastic Waist Trunks – Ultimate Warmth and Comfort for Cold Weather
Stay warm and comfortable all day with the Guardian Thermal Elastic Waist Trunks, designed for men who need superior insulation without sacrificing breathability. These men’s thermal underwear trunks are made from advanced heat-retaining fabric, ensuring you stay warm even in the coldest conditions.
Engineered for winter wear, these thermal trunks trap body heat while allowing airflow, preventing sweat buildup and keeping you dry. The soft, elastic waistband provides a secure yet comfortable fit, making them ideal for layering under jeans, trousers, or workwear. Whether you're working outdoors, commuting on a frosty morning, or relaxing at home, these lightweight yet insulating men’s trunks offer unmatched warmth and comfort.
Features:
✅ Thermal fabric technology – Retains heat for all-day warmth
✅ Breathable and moisture-wicking – Keeps you dry and comfortable
✅ Elastic waistband – Ensures a secure, flexible fit
✅ Lightweight and soft – Provides warmth without bulk
✅ Durable and easy-care fabric – Designed for everyday wear
Don’t let the cold disrupt your day. Upgrade your winter essentials with the Guardian Thermal Elastic Waist Trunks for warmth, breathability, and all-day comfort.
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Cotton Care
For men’s cotton shirts and garments, wash in cold or warm water using a mild detergent, avoid bleach, tumble dry on low or line dry to prevent shrinkage, and iron while slightly damp for best results.
Wool Fabric Care
To care for men’s wool jumpers, suits, and knitwear, hand wash in cold water or use a wool cycle with a wool-safe detergent, always lay flat to dry, steam out wrinkles instead of ironing, and store garments folded to avoid stretching.
Man-Made Fabric Care (Polyester, Nylon, etc.)
Men’s clothing made from man-made fabrics like polyester or nylon should be machine washed cold, dried on low or air-dried to avoid heat damage, ironed on a low setting or steamed if needed, and benefits from being wrinkle-resistant and low-maintenance.
All orders are processed and shipped with Royal Mail within 2 business days, except when an order is received during a holiday period, the order is then shipped on the next working day after said holiday.