Quick Summary
UtopyaUK women’s thermal underwear set in Black, size M, is a long johns-style base layer set for wearing under clothes. The set is described as a top and bottom and uses a fleece finish.
The thermal top has a wide flat boat neck without stitching, which is intended to sit discreetly under clothing. The fabric composition is stated as 95% polyester and 5% elastane.
Key Details
| Detail | Verified information and buyer relevance |
|---|---|
| Brand | UtopyaUK, helping you match the item to the intended product range. |
| Product type | Women’s thermal underwear set, described as a pyjama long johns base layer top and bottom. |
| Colour | Black, a common neutral choice for wearing under outer layers. |
| Size | M, so checking the selected size matters before choosing an offer. |
| Fabric composition | 95% polyester and 5% elastane. |
| Top design | Wide flat boat neck without stitching for a lower-profile look under clothing. |
| Finish | Fleece. |
What to Compare Before Buying
- Size: This set is size M, so compare it with the fit you need for layering.
- Set type: It is a top and bottom set, which matters if you want a matching base layer rather than a single garment.
- Fabric mix: The stated blend is 95% polyester and 5% elastane, so check whether that composition suits your preference.
- Neckline: The top uses a wide flat boat neck without stitching, which may matter if you want a discreet layer under other clothing.
Before You Decide
Confirm the Black size M version is the one you want, and check that you are choosing the full top-and-bottom set. If the neckline matters for wearing under clothing, the flat boat neck design is a useful detail to review before ordering.





