Men's Slim Fit Thermal Base Layer Set – Long Sleeve Top & Pants Warm Underwear (S–3XL)

The Layer That Makes Every Outfit Warmer.

Warmth starts from the inside. This slim-fit thermal base layer set — a long sleeve top and matching thermal pants — is the cold-weather essential that goes under everything and makes everything work better in autumn and winter. Solid color construction, a streamlined slim fit that layers without bulk, and comfortable fabric that stays comfortable through active sport and everyday wear.

Available in multiple colorways across sizes S through 3XL. The base layer that earns its place in every winter wardrobe.

Key Features

• Slim Fit Cut — Streamlined silhouette that layers under outerwear without adding bulk.
• Thermal Fabric — Warm base layer material designed for autumn and winter sport and fitness use.
• Matching Long Sleeve & Pants Set — Complete 2-piece base layer coverage from top to bottom.
• Solid Color Options — Clean, versatile colorways that work under any outfit.
• Sizes S–3XL — Comfortable sizing range for a slim-fit base layer.

Run warmer. Train longer. Layer smarter. This base layer set gives you the thermal foundation to get the most out of every winter workout and cold-weather day.

What's Included

One (1) long sleeve thermal top and one (1) matching thermal pants in the selected color and size.

Frequently Asked Questions

Is this designed to be worn as a base layer or standalone?
Primarily designed as a thermal base layer to be worn under outerwear, but can also be worn as standalone loungewear or lightweight sportswear.

Is the fabric stretchy for sport use?
Yes — the slim-fit thermal fabric includes stretch for comfortable active movement during sport and fitness use.

Are the pieces sold as a set?
Yes — sold as a complete 2-piece base layer set.

How does sizing run for a base layer?
Select your standard size for a true slim-fit base layer feel. Size up if you prefer a slightly looser fit under heavy outerwear.

Is this machine washable?
See care label for fabric and washing instructions.

SPECIFICATIONS

Product Type: Men's 2-Piece Thermal Base Layer Set
Style: Base Layer / Warm Underwear / Fitness
Fit: Slim Fit
Sleeve: Long Sleeve
Sizes: S, M, L, XL, XXL, XXXL
Season: Autumn / Winter
Weight: 0.91 lbs (0.414 kg)

Note: Color variant names are pending update — select from available options above.