Men's Very Cold Thermal Top Portwest B123

-10%

Portwest Men's Polycotton Thermal Jersey B123

Reference PWB123

In stock: Ships within 48 hours

€15.21 TTC €16.90 -10%

Tarif dégressif dès 2 pièces 16,90 € · dès 10 13,85 €

1 pièce	2	3 à 4	5 à 9	10 à 24	25 à 49	50 à 99	100 et +
16,90 €	16,90 €	14,87 €	14,36 €	13,85 €	13,35 €	12,84 €	12,33 €

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SUMMARY

The Portwest B123 thermal top is a long-sleeve base layer with a crew neck, in polycotton, to wear next to the skin under work clothes. The knit stays soft and breathes when it gets warmer. Wear it next to the skin, never over another layer. Pair it with the B121 thermal long johns for a complete set. Sizes XS to 6XL.

TECHNICAL DESCRIPTION

Long Sleeve Thermal Top Men — Portwest

PROTECTION Very Cold

MATERIAL Polycotton 50/50

USE Professional

THERMAL PROTECTION Down to −20 °C* / −4 °F

Cut Crew neck, long sleeves

The base layer for the upper body: arms and chest covered under your work clothes

The B123 thermal top brings warmth to the chest and arms. Its polycotton knit stays soft on the skin, the way the fabric is made lets it breathe when conditions turn too warm, and the crew neck lets you wear it as underwear.

It is worn next to the skin: an extra layer in between blocks moisture from escaping and cancels the thermal effect.

It is the upper body's first layer, to pair with the B121 thermal long johns. Sizes XS to 6XL.

Grand-Froid expert's view

Under a work shirt or a fleece, the crew neck goes unnoticed and the long sleeves cover the wrists, where the cold gets in. Put it on in the morning, next to the skin, before your work clothes. For the lower body, pair it with the Portwest B121 thermal long johns. The warmth of your chest depends on the base layer, not on the jacket.

thermal top men Portwest B123 - very cold −20 °C / −4 °F

What is it designed for?

A base layer for men exposed to the cold, at work and outdoors.

Cold work under work clothes: a layer close to the skin under the fleece or jacket
Handling and repetitive movements outdoors: wide movements of the upper body
Long standing jobs outdoors: torso kept warm when you barely move
Travel and waiting in cold weather: worn under ordinary clothing
Complete it with the Portwest B121 thermal long johns for a full base layer set, from top to bottom

Thermal protection

The knit holds warm air against the chest and arms, under a work shirt, a fleece or a parka. Under a fleece and a parka, it completes the layering system for days of moderate effort. Cotton retains moisture: for sustained effort that makes you sweat, choose a merino wool or synthetic base layer.

Technical specifications

Crew neck
Long sleeves
Fit — comfortable

Composition

Knit — 50 % polyester, 50 % cotton, 200 g/m²

Commitments

EN 14058 — protective clothing against cool environments: class 2, thermal resistance 0.137 m²·K/W
CE conformity

Size guide

Measure your chest at the widest point, arms down by your sides. Between two sizes, take the larger one to stay comfortable under work clothes.

Size	Chest (cm)
XS	80–88
S	92–96
M	100–104
L	108–112
XL	116–124
2XL	128–132
3XL	136–140
4XL	144–148
5XL	152–160
6XL	164–172

Body measurements in cm.

Care & Durability

Washing: machine wash at 40 °C / 104 °F maximum, gentle cycle
Bleaching: avoid
Drying: air dry on a line, no tumble dryer
Ironing: 150 °C / 302 °F maximum

Return or exchange — 30 days

You have 30 days after receipt to request a return or exchange for this item.

Why choose the Portwest B123 thermal top?

The base layer for the upper body: a soft polycotton knit with a crew neck and long sleeves, that slips under work clothes.

The three-layer system:

1st layer — base (role of this product): next to the skin. Captures body heat and moves perspiration outwards.
2nd layer — mid layer: insulates and holds warm air around the body. Fleece, knit or thermal top.
3rd layer — outer: shell, softshell jacket or padded gilet. Blocks wind and holds warmth. In sustained rain, a hardshell takes over.

For a complete base layer, pair this top with the Portwest B121 thermal long johns: matching top and bottom.

* Indicative temperature. Perceived warmth varies with activity, body type, humidity, wind and the layers worn underneath.