How does far-infrared thermal technology work in clothing?

Far-infrared (FIR) technology uses special fibers that absorb your body's natural heat and reflect it back as far-infrared radiation. This creates a microclimate of warmth around your body, boosting perceived temperature by approximately 5°C (9°F) without adding bulk. It's the same principle used in therapeutic heating pads and NASA space suits.

Can I remove the built-in bra?

Yes. The built-in bra features removable padding with an invisible bust line. You can wear it with the bra for full support as a standalone piece, or remove the pads to use it purely as a base layer under other clothing.

What is Hush Fiber fabric?

Hush Fiber is a premium Japanese textile made from ultra-fine 1.0T fibers (1/10 the thickness of human hair). It delivers a silk-like feel against the skin while providing exceptional warmth retention. The fabric blend is 56% Nylon, 38.5% Viscose, and 5.5% Spandex.

Will this create static cling?

No. The Hush Fiber fabric is specifically treated with anti-static properties, eliminating the crackling and clinging that plagues traditional thermal underwear in dry winter conditions.

How thin is this base layer?

Extremely thin — the 1.0T fiber is 1/10 the thickness of a human hair. This means the thermal tank top adds virtually no bulk under your clothes, maintaining a streamlined silhouette while delivering +5°C warmth.

What sizes are available?

Available in S, M, L, XL, and 2XL. The stretchy Spandex blend provides a comfortable, flexible fit. We recommend checking our size chart — sizing may run slightly smaller than standard North American sizing.

CatWarm™ Infrared Thermal Tank Top with Built-in Bra | Hikesity

Name: CatWarm™ Infrared Thermal Tank Top with Built-in Bra | Hikesity
Brand: HIKESITY
Price: 49.0 CAD
Availability: InStock

$49.00

Shipping calculated at checkout.

Import Duties & Taxes Pre-paid (No Surprise Fees)

Bra Included: Built-in bra for support, but you can take it out too.
Super Soft: Made with comfy Japanese fabric you'll love to wear.
Stays Warm: Keeps you 5 degrees warmer, even on the coldest days.
Perfect Layer: Wear it under clothes for extra warmth, or on its own.

Material

Main fabric: Nylon 56%, Viscose 38.5%, Spandex 5.5%
Lining: Nylon 38%, Viscose 54%, Spandex 8%

Color: Grey

Grey

Black
Grey
Brown
White

Size: S

Quantity

Warmth without the bulk. Support without the wire.

Ditch the heavy layers this winter with the Hikesity Women's Infrared Square Neck Thermal Tank Top. Crafted from luxuriously soft Japanese fabric, this 2-in-1 base layer combines a supportive, built-in bra with advanced heat-trapping technology to boost your body temperature by up to +5.2°C.

Why You'll Reach For It Every Day

🔥 Proven +5.2°C Warmth: Advanced far-infrared technology actively captures, stores, and reflects your body's natural heat.
✨ 2-in-1 Built-In Bra: Features upgraded, removable padding and an invisible bust line so you can skip the uncomfortable underwire.
🪶 Second-Skin Feel: Made with ultra-thin 1.0T Japanese Hush Fiber (1/10th the thickness of a human hair)—silky, breathable, and completely bulk-free.
⚡ Zero Static: Specially treated anti-static fabric means say goodbye to annoying winter "crackling" and clinging.

Hikesity Thermal Tank Top

Versatile thermal design

Hikesity Japanese thermal fabric

CatWarm Far-infrared heating

Seamless built-in bra

Size Guide

The Magic Behind CatWarm™ Technology

Traditional winter base layers rely on heavy, restrictive thickness for warmth. CatWarm™ takes a smarter approach: far-infrared reflection. This innovative technology captures your body's heat and continuously redirects it back to your skin. The result? A tank top thinner than your favorite t-shirt, but guaranteed to keep you warmer than standard, bulky thermals.

📖 Learn more about the science of CatWarm™ →

🛒 Complete Your Ultimate Winter Set:
Pair your tank with our CatWarm™ Cardigan and matching Leggings for head-to-toe, bulk-free warmth.

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