What is this thermal underpants designed for?

It is worn as an insulating base layer under workwear to keep your body warm and dry in cold conditions.

What are the size and fit of this model?

This model comes in combined size L/XL with a stretch, close-fitting cut for freedom of movement.

What materials is this thermal underwear made of?

It is made of polyamide, polypropylene, and elastane to ensure thermal insulation, elasticity, and moisture management.

Does this thermal base layer prevent chafing?

Yes, its flatlock seams reduce friction and help prevent skin irritation during active work.

Is this product flame-retardant or arc-flash rated?

No, this garment is neither flame-retardant nor rated for arc-flash protection.

OPSIAL FRIESK long thermal trousers (black) - 67648781 OPSIAL 67648781

Name: OPSIAL FRIESK long thermal trousers (black) - 67648781
Brand: OPSIAL
SKU: 10384
Price: 17.71 EUR
Availability: InStock

Supplier number: OPSIAL 67648781 | EAN 3661578138969

17.71 tax incl.

€14.63 excl. VAT (incl. all environmental contributions)

Clothing size *

Stock is shown per size

S/M In stock L/XL In stock XXL/3XL In stock

In stock On backorder Unavailable

On stock - immediately available

Ordered before 20:00 - delivered tomorrow 05/11/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL

↓ Documents (1) ✆ Talk to a specialist

Reliable warmth and active comfort

Practical benefits

Effective thermal insulation: The specialized stretch fabric retains your body heat to keep you warm during cold workdays.
Friction-free flat seams: Flatlock stitching prevents skin irritation and chafing under your outer layers throughout the day.
Targeted breathable ventilation: Dedicated ventilation zones at the crotch allow moisture and excess heat to escape efficiently during activity.

In a nutshell

The right choise for

Stay comfortably warm and fully mobile on cold workdays with the Opsial Friesk long thermal underpants in size L/XL. Designed to act as an effective insulating base layer under your regular work trousers, this garment protects you from low temperatures on outdoor jobsites or in cold storage warehouses. The stretch fabric actively retains body heat, while dedicated ventilation zones at the crotch allow excess moisture to escape quickly during heavy activity. Featuring flatlock seams to prevent friction and skin irritation, it provides close-fitting comfort so you can perform demanding work without restriction.

Product information FAQ

€17.71

In stock - tax incl.

Key features according to our expert

Color: Black
Thermally insulating: Yes
Flame-retardant: No
Leg length: Long
Material: PA - Polyamide (Nylon®); Polyester; Elastane(spandex)
Colour (manufacturer): Black
Women/Men: Men
Arc flash protection: No
Properties: Long; Thermal

Product description

THERMAL LEGGINGS FRIESK
Thermal leggings made of polyamide / polypropylene / elastane.
Stretch fabric and slimfit fit.
Friction-resistant design: flat seams to prevent irritation.
Ventilation zones at the crotch for better ventilation.
Colour: Black.

Documents

⤓ Product sheet PDF

All Features

Color: Black
Thermally insulating: Yes
Flame-retardant: No
Leg length: Long
Material: PA - Polyamide (Nylon®); Polyester; Elastane(spandex)
Colour (manufacturer): Black
Women/men: Men
Arc flash protection: No
Properties: Long; Thermal

Brand OPSIAL
08099568
EAN 3661578138969
Supplier number OPSIAL 67648781

Frequently asked questions about this product

Answered by specialists

What is this thermal underpants designed for?: It is worn as an insulating base layer under workwear to keep your body warm and dry in cold conditions.
What are the size and fit of this model?: This model comes in combined size L/XL with a stretch, close-fitting cut for freedom of movement.
What materials is this thermal underwear made of?: It is made of polyamide, polypropylene, and elastane to ensure thermal insulation, elasticity, and moisture management.
Does this thermal base layer prevent chafing?: Yes, its flatlock seams reduce friction and help prevent skin irritation during active work.
Is this product flame-retardant or arc-flash rated?: No, this garment is neither flame-retardant nor rated for arc-flash protection.