What material is the Projob 3501 long john made from?

This thermal underwear is made from 100% polyester with a fabric weight of 135 g/m².

Does this thermal base layer have a fly?

Yes, this model includes an integrated fly.

Is the Projob 3501 flame-retardant or ARC-rated?

No, this thermal long john offers neither flame-retardant nor ARC flash protection.

How does this thermal underwear fit?

It offers a snug fit that moves with your body, featuring an elastic waistband and knitted ankle cuffs.

Who is this base layer designed for?

This size L model is designed for men as an insulating base layer under workwear.

PROJOB 3501 pants black - 643501-99-6 PROJOB 643501-99-6

Name: PROJOB 3501 pants black - 643501-99-6
Brand: PROJOB
SKU: 152600
Price: 16.2 EUR
Availability: InStock

Supplier number: PROJOB 643501-99-6 | EAN 7331622021009

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 02/10/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL

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Reliable warmth with the Projob 3501 long johns

Practical benefits

Effective cold weather insulation: The lightweight polyester fabric effectively retains your body heat, keeping you comfortable in chilly working conditions.
Unrestricted freedom of movement: A snug and ergonomic fit follows your body contours easily, layering smoothly beneath your work trousers.
Secure stay in place fit: Featuring an elasticated waistband and knitted leg cuffs, this base layer prevents slipping during active physical tasks.

In a nutshell

The right choise for

With the Projob 3501 thermal long johns, you stay comfortably warm during demanding work in cold weather or unheated facilities. Designed for men in size L, this black base layer is crafted from 100% polyester at 135 g/m² to effectively retain body heat without adding bulky weight. Its snug, body-hugging fit moves naturally with you and layers seamlessly beneath your everyday work trousers or overalls. Featuring an elasticated waistband, knitted ankle cuffs, and a practical fly, it provides reliable warmth and freedom of movement throughout the workday.

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
Thermal: 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
Thermal: 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: L
Color code: 99
Weight: 135 g/m²
Size code: 6

Brand PROJOB
01045309
EAN 7331622021009
Supplier number PROJOB 643501-99-6

Frequently asked questions about this product

Answered by specialists

What material is the Projob 3501 long john made from?: This thermal underwear is made from 100% polyester with a fabric weight of 135 g/m².
Does this thermal base layer have a fly?: Yes, this model includes an integrated fly.
Is the Projob 3501 flame-retardant or ARC-rated?: No, this thermal long john offers neither flame-retardant nor ARC flash protection.
How does this thermal underwear fit?: It offers a snug fit that moves with your body, featuring an elastic waistband and knitted ankle cuffs.
Who is this base layer designed for?: This size L model is designed for men as an insulating base layer under workwear.