# Portwest B123 Insulated Thermal T-Shirt X-Large

Experience warmth and comfort with Portwest B123 Insulated Thermal T-Shirt for everyday cold weather layering and workwear versatility.

- [Original product page](https://www.ofertitastop.com/uk/product/portwest-b123-insulated-thermal-shirt-large)
- [View offer](https://www.ofertitastop.com/uk/visit/portwest-b123-insulated-thermal-shirt-large)
- Market: UK
- Language: en-GB
- Currency: GBP
- Product updated: 2026-10-17T06:05:31.416Z
- Brand: Portwest
- MPN: B123BKRXL
- EAN / GTIN: 5036108228034
- SKU: ofertitastop-uk-11368
- Category: Clothing & Accessories > Clothing > Shirts & Tops
- Source store: amazon UK
- Active deal: Yes
- Price: 9.78 GBP
- Previous price: 10.86 GBP
- Discount: 10%
- Rating: 4.6 / 5
- Reviews: 1549

Prices and deal status are the latest recorded data, not a guarantee of availability. Confirm the price and availability with the store.

## Description

This long-sleeve insulated thermal t-shirt from Portwest offers straightforward warmth and a comfortable fit for everyday cold-weather layering. It works well as a base layer for outdoor work or casual wear, and it can be a practical thermal t-shirt for cold weather without adding bulk.

## Key Points

The garment features a classic crew neck and long sleeves with a relaxed cut that allows freedom of movement while keeping heat close to the body. The fabric blend gives a balance of breathability and warmth, and the available colour options make it suitable for both work uniforms and everyday use. 😊

Care instructions are simple and practical, with a maximum washing temperature of 40°C using a gentle cycle, and ironing limited to 150°C. For longevity, avoid bleaching and tumble drying, and dry the shirt on a line. Consider that according to the manufacturer, the insulation is intended for general thermal protection and may not be sufficient for extreme conditions or specialist cold-weather work. ❄️

## Technical Specifications

- Name: **Portwest B123 Insulated Thermal T-Shirt Long Sleeve Black, X-Large**
- Fabric: 50% Polyester, 50% Cotton
- Sizes available: XS, S, M, L, XL, 2XL, 3XL, 4XL, 5XL
- Colours: Sky blue, White, Grey, Navy, Black
- Care: Wash at max 40°C gentle process, do not bleach, do not tumble dry, line dry, iron max 150°C, do not dry clean

## Usage Recommendations

Layer this shirt under a work jacket or over a base layer depending on activity levels and external temperature. For physical tasks, the polyester content helps wick moisture while the cotton keeps the feel soft against skin, so it is practical for both indoor and outdoor shifts. For casual wear, pair with a fleece or lightweight insulated jacket on cooler days.

If you plan extended exposure to very low temperatures, combine this t-shirt with a heavier insulating layer and windproof outerwear. Also note that the mix of fibres may slightly affect drying time compared with fully synthetic baselayers, so allow extra time when air drying after washing. 🚧

## Images

![Portwest B123 Insulated Thermal T-Shirt X-Large — 1](https://www.ofertitastop.com/i/k2TYZFVsvhQqd-4mEmj7aYpM1QheKEZRiIojhDdb8G0Y46uvY2_3YQ04vgKL3eoCOFXYrVTem16u8z_FF32Mj2p9jiGCPjXqaLC4Ubh5t7MlPAry7i5c-Q.jpg)

![Portwest B123 Insulated Thermal T-Shirt X-Large — 2](https://www.ofertitastop.com/i/CM6vGYroeN6WjReh6vKdLBuSlv5qqrTkNNquRiQRmIUWaYFa26k16lmDF7nvj9kkHSd7VhAniigl2A-9PZ3QuSrJHsmUiZzUDCOchZxHJY1VZXWMheBbJw.jpg)

![Portwest B123 Insulated Thermal T-Shirt X-Large — 3](https://www.ofertitastop.com/i/dWeWzWvoXEfPjz08o-ml8c3F9eLTXLENWPY8KqfD_Grcug4w0HlaDgwCUsFANHk2l71Z7sxTqmovpPSIGxfu-kdQP_cUyfnyuqZJg2fKR3EGH-0-2nq6TQ.jpg)

![Portwest B123 Insulated Thermal T-Shirt X-Large — 4](https://www.ofertitastop.com/i/dXU3Ts7YXsyHcNBVuPAoxkT_KXO6ixsCE__ZVRg1ztIIGZFfHu1KxRydtv__yFozzGAS9PUzeg0IC_jlvc2eSMQMqQmDBsk2c8p_y2GQ4t9Bo22loax-YQ.jpg)

![Portwest B123 Insulated Thermal T-Shirt X-Large — 5](https://www.ofertitastop.com/i/QnsPHvFDAN7Lz0Hj6uD_fqMerG_N0tnyQEgdnQUA8qzOFAMrEHoDsxZKj84fuXdtNaYiRDMywpRPIsHlplDJZCXu8BHJ534U41r_pusIcu6TwfUN-anFaw.jpg)