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SIMIYA Mens Thermal Underwear Set, Long Sleeve Base Layer, Fleece Lined, Black

£23.99 (as of 23/12/2025 12:22 GMT - DetailsProduct prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply to the purchase of this product.)

SIMIYA mens thermal underwear set in black with a long sleeve base layer and bottoms, fleece lining, 4-way stretch fabric, a tag-less design and a fly/pee hole. It also includes a free cutting design for the leg and arm openings with a maximum tailoring range of 1.18 inches, so check the size chart before ordering.

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Quick Summary

The SIMIYA mens thermal underwear set is a long sleeve base layer with a fleece lining, made for cold weather wear. It is presented as a top and bottoms set in black, with a 90% polyester and 10% spandex fabric blend for added flexibility.

The set also includes a tag-less design, a fly/pee hole in the thermal pant, and a free cutting design for the leg and arm openings with a maximum tailoring range of 1.18 inches.

Who It Is Best For

This set suits buyers looking for thermal tops and bottoms for winter layering, outdoor activities, or general cold-weather wear. Check the selected size and the tailoring range before ordering if you want to adjust the fit.

Key Details

DetailVerified information and buyer relevance
BrandSIMIYA, as named in the product title.
Product typeMens thermal underwear set with long sleeves and long johns style bottoms.
ColourBlack.
Fabric blend90% polyester and 10% spandex for the stated fabric construction.
LiningFleece lined inside.
Fit features4-way stretch fabric and a tag-less design.
Bottoms detailFly/pee hole included in the thermal pant.
AdjustabilityFree cutting design for the leg and arm openings, with a maximum tailoring range of 1.18 inches.

Why Buyers Choose It

  • The fleece lining is intended for cold weather layering.
  • The 4-way stretch fabric is described as supporting unrestricted movement.
  • The tag-less design is included for reduced skin irritation.
  • The free cutting design gives some room to tailor the leg and arm openings within the stated range.

What To Know Before You Buy

Check the size chart before ordering, especially if you plan to use the cutting option for the sleeves or legs. The set is black and includes both thermal tops and bottoms, so make sure that matches your preferred colour and layering needs.

Because the bottoms include a fly/pee hole, buyers who want that detail should find it useful, while others may prefer to check the fit and style carefully before choosing.

Common Buyer Questions

Does this come as a top and bottoms set?
Yes, it is a thermal underwear set with both tops and bottoms.

Can the cuffs be adjusted?
Yes, the set includes a free cutting design for the leg and arm openings, with a maximum tailoring range of 1.18 inches.

Does the thermal wear have a lining?
Yes, it has fleece lining inside.

Is there a fly opening in the bottoms?
Yes, the thermal pant is designed with a fly/pee hole.

Final Buying View

If you want a black mens thermal underwear set with a fleece lining, stretch fabric, and adjustable opening lengths, this SIMIYA set covers those stated features. Review the size chart and the tailoring range before ordering to make sure the fit matches your needs.

Brand

SIMIYA

Manufacturer

SIMIYA

Product Group

Apparel

Model

WU03-1

Color

Black

Item Weight

0.84 pounds

Size

S

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