Outdoor, sport and everyday productsShop smarter, all in one place.
UK edition · GBP

SIMIYA Men’s Thermal Underwear Set, Fleece-Lined Base Layer, Black

£23.99 (as of 02/05/2026 12:28 BST - 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.)

The SIMIYA men’s thermal underwear set is a black long-sleeve base layer and long johns set with fleece lining, 4-way stretch fabric, and a tag-less design. It also includes a fly or pee hole in the thermal pant and an adjustable length design for the leg and arm openings, with a stated maximum tailoring range of 1.18 inches.

You might also need

Reebok Men's Johny Lounge Pants, Charcoal Marl, M£16.78 (as of 01/11/2026 08:39 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.)View on Amazon
Craghoppers Mens Expert Corey 200 Fleece Top XXL Dark Navy£24.02 (as of 01/11/2026 09:03 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.)View on Amazon
Outdoor Ventures Waterproof Pullover Rain Jacket for Men Lightweight Hooded Packaway Anorak, Army Green, S£35.99 (as of 26/10/2026 20:43 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.)View on Amazon
SKU: B0B58JXPPC Category:

As an Amazon Associate we earn from qualifying purchases.

Compare with similar Men's Base Layer Tops

TACVASEN Men's Black Long Sleeve 1/4 Zip Top, Size L£21.98 (as of 08/11/2026 16:18 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.)View on Amazon

As an Amazon Associate we earn from qualifying purchases.

Quick Summary

The SIMIYA men’s thermal underwear set is a long-sleeve base layer and long johns set in black, made for colder weather wear. It features fleece lining inside, a crew neck top, and a fly/pee hole in the men’s thermal pant.

The set is described as having 4-way stretch fabric, a tag-less design, and an adjustable length design for the leg and arm openings, with a stated maximum tailoring range of 1.18 inches.

Who It Is Best For

This set suits buyers looking for thermal tops and bottoms for cold winter use, especially where warmth, stretch, and a closer-fitting base layer are important. It is also aimed at people who want a set that can be adjusted at the openings within the stated tailoring range.

Key Details

DetailVerified information and buyer relevance
Product typeMen’s thermal underwear set with thermal base layer long sleeves and long johns.
ColourBlack.
Fabric content90% polyester and 10% spandex, described as a blend for flexibility and warmth.
LiningFleece lined inside for colder weather wear.
Stretch4-way stretch fabric for unrestricted movement.
Adjustment featureAdjustable length design for leg and arm openings, with a maximum tailoring range of 1.18 inches.
Design detailsCrew neck top, tag-less design, and fly/pee hole in the thermal pant.

Why Buyers Choose It

  • Fleece lining is included, which supports warmer wear in colder conditions.
  • 4-way stretch fabric gives the set more give for movement during active use.
  • The adjustable length feature lets the openings be cut within the stated range for a closer fit.
  • The tag-less design and fly/pee hole are practical details that may matter for everyday wear.

What To Know Before You Buy

Check the size chart before ordering to make sure the fit is right for you. The set is black and includes long-sleeve top and long johns style bottoms, so confirm that this is the format you want. If you plan to use the cut-to-length feature, review the stated maximum tailoring range of 1.18 inches before making any changes.

Common Buyer Questions

What is included in the set?
A thermal base layer long sleeves top and long johns style bottoms are included.

Does it have a lining?
Yes, it is fleece lined inside.

Can the length be adjusted?
Yes, the leg and arm openings have an adjustable length design with a stated maximum tailoring range of 1.18 inches.

Does the bottom have a fly opening?
Yes, the thermal pant is designed with a fly or pee hole.

Final Buying View

If you want a black men’s thermal underwear set with fleece lining, stretch fabric, and a cut-to-length feature, this set gives you those verified details in one bundle. Check the size chart and the tailoring range before ordering so the fit and adjustment suit your needs.

Brand

SIMIYA

Manufacturer

SIMIYA

Product Group

Apparel

Model

WU03-2

Color

Black

Item Weight

0.90 pounds

Size

M

Scroll to Top