What material is this thermal long john made of?

The long john is made of 100% polyester with a fabric weight of 135 g/m².

Does this thermal underwear feature a fly?

Yes, this model includes a functional fly.

What fit does the ProJob 3501 provide?

It is a men's long fit in size XL with an elasticated waist and knitted cuffs at the leg ends.

Does this underwear offer flame or ARC protection?

No, this garment is not flame retardant and does not offer ARC protection.

PROJOB 3501 pants black - 643501-99-7 PROJOB 643501-99-7

Name: PROJOB 3501 pants black - 643501-99-7
Brand: PROJOB
SKU: 152600
Price: 16.2 EUR
Availability: InStock

Supplier number: PROJOB 643501-99-7 | EAN 7331622021016

16.20 tax incl.

€13.39 excl. VAT (incl. all environmental contributions)

Clothing size *

Stock is shown per size

XS On backorder S In stock M In stock L In stock XL In stock XXL In stock 3XL On backorder

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
Delivered from Belgium

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Reliable thermal comfort for cold work environments

Practical benefits

Effective body heat retention: The Projob 3501 keeps you comfortably warm in low temperatures with its insulating polyester fabric.
Ergonomic freedom of movement: The close-fitting design follows your natural body movements, ensuring full flexibility during active shifts.
Secure and stable fit: An elasticated waistband and knitted leg cuffs ensure your base layer stays firmly in place.

In a nutshell

The right choise for

Keep your body warm and comfortable in cold working conditions with the Projob 3501 thermal long john. Made from 100% polyester with a fabric weight of 135 g/m², this men's base layer fits smoothly under your regular work trousers without adding bulky weight, making it ideal for outdoor job sites and cold storage environments. The insulating fabric retains body heat while wicking away perspiration to keep you dry throughout the shift. With an elasticated waistband, knitted leg cuffs, and a flexible fit, it stays securely in place as you move. a functional fly provides added practical convenience on the job.

Product information FAQ

€16.20

In stock - tax incl.

Key features according to our expert

Women/Men: Men
Color: Black
Properties: Long; Thermal; With fly
Weight/m²: 135 g/m²
Arc flash protection: No
Colour (manufacturer): Black
Material: 100% Polyester
Leg length: Long
Flame-retardant: No
Thermally insulating: Yes

Product description

Functional long johns with a fit that follows body movements
Fits snugly to body for optimal ventilation
Elastic waist
Knitted leg ends.

All Features

Women/men: Men
Color: Black
Properties: Long; Thermal; With fly
Weight/m²: 135 g/m²
Arc flash protection: No
Colour (manufacturer): Black
Material: 100% Polyester
Leg length: Long
Flame-retardant: No
Thermally insulating: Yes
Color comment: black-99
Fit: Slim
Gender: Men
Care instructions: Gentle machine wash 60 degrees;Tumble at low temperature;Withstands no liquids stronger than perchlorethylene.;Bleach not allowed;Ironing. Highest temperature allowed110 degrees
Size: XL
Color code: 99
Weight: 135 g/m²
Size code: 7

Brand PROJOB
01045310
EAN 7331622021016
Supplier number PROJOB 643501-99-7

Frequently asked questions about this product

Answered by specialists

What material is this thermal long john made of?: The long john is made of 100% polyester with a fabric weight of 135 g/m².
Does this thermal underwear feature a fly?: Yes, this model includes a functional fly.
What fit does the ProJob 3501 provide?: It is a men's long fit in size XL with an elasticated waist and knitted cuffs at the leg ends.
Does this underwear offer flame or ARC protection?: No, this garment is not flame retardant and does not offer ARC protection.