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Thermis Core — Cold-Proof Comfort for Winter

£47.99

Shipping Policy:

  • We ship to all locations within the United States and internationally.
  • Orders are typically processed and shipped within 2-3 business days.
  • Shipping rates will vary based on the size and weight of the item(s) and the destination.
  • Expedited shipping options are available for an additional cost.

🔥 Warm fleece-lined interior for all-day comfort
👖 Classic straight-leg fit for a clean, flattering look
🌬️ Soft, breathable fabric — cozy without feeling heavy
🧥 Easy to style for home, travel, or casual outings
⚫⚪ Available in timeless Black and Grey
🧼 Machine washable & low maintenance
📏 True-to-size fit (L–5XL)

📏 Men’s Trouser Size Guide (Waist Measurement)
How to Measure: Measure around your natural waist where the trousers normally sit. Keep the tape snug, not tight.

Size Waist (Inches) Waist (CM) Standard Equivalent
L 32–33" 81–84 cm Medium (M)
XL 33–34" 84–86 cm Large (L)
2XL 36–38" 91–96 cm Extra Large (XL)
3XL 38–39" 97–99 cm 2XL
4XL 40–41" 102–104 cm 3XL


Important Fit Notes
This product starts at Medium (32" waist) – there is no Small size.
If you are between sizes, choose the larger size for comfort.
Measurements are taken from the actual garment sizing.
Manual measurement may vary by 1–3 cm.


Quick Size Help
34–35" waist → choose XL
36–38" waist → choose 2XL
38–40" waist → choose 3XL
40–41" waist → choose 4XL

  • No Compromises In Quality
  • 100% Satisfaction Guarantee
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How to Measure: Measure around your natural waist where the trousers normally sit. Keep the tape snug, not tight.

Size Waist Standard Equivalent
L 32–33" (81–84 cm) Medium (M)
XL 33–34" (84–86 cm) Large (L)
2XL 36–38" (91–96 cm) Extra Large (XL)
3XL 38–39" (97–99 cm) 2XL
4XL 40–41" (102–104 cm) 3XL
Important Fit Notes
  • This product starts at Medium (32" waist) – there is no Small size.
  • If you are between sizes, choose the larger size for comfort.
  • Measurements are taken from the actual garment sizing.
  • Manual measurement may vary by 1–3 cm.
Quick Size Help
  • 34–35" waist → choose XL
  • 36–38" waist → choose 2XL
  • 38–40" waist → choose 3XL
  • 40–41" waist → choose 4XL


✅ Guaranteed Winter Warmth → Thick thermal fleece traps body heat in freezing temperatures

✅ Wind Won’t Get Through → Dense outer shell blocks harsh, icy gusts

✅ Stay Dry in Snow & Rain → Water-resistant fabric repels moisture on contact

✅ Move Freely, Stay Warm → Insulated without the bulky snow-pant feel

✅ No Sweat, No Overheating → Breathable lining regulates body temperature

✅ All-Day Waist Comfort → Stretch elastic waistband moves with your body

✅ Built for Daily Winter Abuse → Rugged construction made for constant cold-weather wear

Serious Winter Protection—Inside and Out

Dual-layer design: weatherproof outside, plush fleece inside.


Built for winter: blocks cold wind while locking in warmth.


Soft against skin: ultra-thick fleece for all-day comfort.


Sleek outside, cozy inside: warmth without bulky volume.


Made for daily cold: commute, work, or relax in total warmth.

Built for Winter Comfort

  • Extreme Winter Warmth

    Thick fleece traps heat in freezing temperatures

  • Wind & Water Resistant

    Blocks cold air, repels snow & light rain

  • All-Day Comfort

    Warm without overheating

  • Indoor & Outdoor Wear

    Commute, work, travel, or lounge

  • Non-Bulky Fit

    Heavy warmth without stiff snow-pant feel

  • Stretch Waistband

    Comfortable, flexible fit

  • Designed for Men

    Tailored fit for men's comfort and movement

  • Built for Winter Use

    Durable for daily cold-weather wear

Frequently Asked Questions

These are heavy-duty winter sweatpants with thick plush fleece lining designed to keep you warm in freezing temperatures, wind, and snow—perfect for extreme cold, not just cool weather.
Yes. The outer shell is water-resistant and fully wind-blocking, protecting you from rain, snow, and icy winds during outdoor use.
Yes. They fit true to size with a relaxed athletic cut. Choose your normal size for everyday comfort. Size up for a looser fit or if layering underneath.
They're made for both indoor and outdoor wear—great for commuting, hiking, work, travel, errands, and staying cozy at home.
Average delivery time is about 8 business days, and customers receive tracking information once the order ships.

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