Core Shield Men's V-Neck Sleeveless Undershirt, UPF50+ Fabric, Near-Infrared Absorbing Fibers, All-Season Wear, PNXIVSM26
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Japan's summer hit — 4,000+ sold. Sold on Rakuten, Amazon Japan & Yahoo! Shopping.
⚠ Import duties for international orders: Prices do not include import duty or VAT. Thailand: approx. 930 THB (about 47% of the item price) will be collected by Thailand Post on delivery. Malaysia: orders under RM500 are exempt. Australia & New Zealand: no import duty or GST on orders under A$1,000 / NZ$1,000. Ships from Japan by EMS (3–8 days). No returns for change of mind; faulty items replaced or refunded. See shipping policy.
The next restock is scheduled for 2027 or later.
If current stock runs out, it will be unavailable until the next production run. Please check your size and color as soon as possible.
Enjoy summer fashion while
fully protecting your body from the sun.
"I understand the benefits of long-sleeve base layers, but they seem too hot for mid-summer..."
The CORE SHIELD® sleeveless top was created to address those concerns.
Sunscreen is designed to block UV rays, which account for only about 5% of the sunlight that reaches the earth's surface. It does not address near-infrared rays, which make up the remaining 42%. This sleeveless top covers your torso—the largest surface area—from both UV and near-infrared rays without restricting movement around the shoulders.
Wearing an ultra-quick-drying base layer is more effective at managing sweat than wearing a single shirt that doesn't absorb moisture.
Don't layer up, just cover. That is the answer this sleeveless top provides.
A sleeveless design tailored for active summer scenes
To address the common frustrations of choosing a summer inner layer—such as "it shows under my clothes," "it's too hot," or "it restricts movement"—the CORE SHIELD® men's V-neck sleeveless inner layer pursues fashionability, breathability, and functionality all at once.
V-neck designed to stay hidden
The V-neck design ensures the inner layer remains hidden even when worn under T-shirts, polo shirts, or open-collar shirts. It protects your body from the sun while allowing you to enjoy your summer outfits without interference.
Breathable design for maximum airflow
With a design that offers just the right amount of room, it prevents the fabric from sticking to the skin and promotes smooth airflow. Combined with the lightness unique to a sleeveless top, it stays comfortable even outdoors in the middle of summer.
Sleeveless design that won't restrict shoulder/arm movement
Because it has no sleeves, you can maximize your arm motion during swings, running, or training. It prevents the tightness or pulling often felt around the shoulders, supporting your performance during sports.
Sunscreen only addresses about 5% of sunlight
Of the solar energy that reaches the earth's surface, only about 5% is UV radiation. The remaining 42% consists of near-infrared rays. Near-infrared rays have longer wavelengths than UV rays and are known to penetrate deep into the skin.
SPF, PA, and UPF are all metrics for UV radiation. There are no standard metrics for evaluating infrared rays. The longer you spend under the sun, the more necessary it is to prepare for near-infrared rays as well as UV rays.
※ Based on the ASTM G173-03 reference solar spectrum (AM1.5 Global Tilt/Terrestrial) integrated by wavelength range. The total does not equal 100% due to rounding.
Trubeaute®, a functional fiber to protect your skin and body
Trubeaute® is a functional fabric that combines threads infused with special ceramic microparticles, which absorb near-infrared rays, and threads infused with titanium oxide, which reflects UV rays. Since the functional components are infused directly into the fibers, performance does not degrade easily with repeated washing.
- Near-infrared absorbing threads: Infused with special ceramic microparticles derived from rare metals, which are also used in heat-shielding films for building and car windows.
- UV-reflecting threads: Combined with titanium oxide-infused threads, the fabric offers UPF 50+ UV protection (test values based on fabric alone).
- Fiber-infused components: Because the active components are inside the fibers, they will not wash off with sweat, and there is no need for reapplication.
Why it is chosen by those who spend time in the sun
Fibers that absorb near-infrared rays
Near-infrared rays make up about 42% of sunlight and are known to reach deeper into the skin due to their longer wavelength compared to UV rays. The fabric itself blocks this range, which is not covered by sunscreen or standard UPF-rated clothing (test values based on fabric alone).
Helps protect against UV rays / UPF 50+
Helps protect against skin-damaging UV rays. Protects your skin during long hours in the sun, such as while playing golf, running, fishing, or working outdoors (test values based on fabric alone).
Quickly wicks sweat and resists sticking
Features roughly double the quick-drying performance of standard polyester fabrics. It stays light even when you sweat, preventing that uncomfortable sticky or clinging feeling.
Contact cooling sensation for instant comfort
Enjoy a refreshing, cool-to-the-touch sensation, perfect for wearing during hot seasons. It remains comfortable even when layered.
Durable performance after multiple washes
Because the functional ingredients are infused into the fibers, performance stays consistent even after repeated washing and wear. It is resistant to pilling, allowing for long-term, confident use.
Recommended for the following people
For golf, running, and training
The sleeveless design doesn't restrict arm movement, allowing you to focus on your swing or form. Perfect for those who want to maximize their athletic performance without worrying about the sun.
For those who want to enjoy summer fashion
The V-neck design remains hidden under T-shirts and open-collar shirts, not interfering with your outfit. A staple summer inner layer for those who want to balance functionality with style.
A high-performance men's sleeveless inner layer suitable for those who don't want their inner layer to ruin their look, prioritize ease of movement, or spend long periods in the sun. For those who want full arm coverage, we also offer a long-sleeve version.
Made in Japan | Quality you can trust for your skin
Because this is an inner layer worn directly against the skin, we never compromise on quality. The "CORE SHIELD V-neck Sleeveless Inner for Men" is a purely domestic product, with all stages—from fabric production to sewing and packaging—carried out within Japan.
We use high-performance sewing machines similar to those used for swimwear. By prioritizing ease of movement, skin comfort, and durability, we have created a garment that is ideal for both sports and daily use.
Product Specifications
Size Chart
Actual Garment Measurements & Recommended Height
Units: cm *Recommended height is for reference only.
| Size | Recommended Height (Men) | Length | Width | Bust | Waist |
|---|---|---|---|---|---|
| S | 162–168 | 68 | 46 | 85–91 | 71–77 |
| M | 167–173 | 70 | 48 | 89–95 | 75–81 |
| L | 172–178 | 72 | 50 | 93–99 | 79–85 |
| XL | 177–183 | 74 | 52 | 97–103 | 83–89 |
| 2XL | 182–188 | 76 | 54 | 101–107 | 87–93 |
| 3XL | 187–193 | 78 | 56 | 105–111 | 91–97 |
※ As this is a sleeveless garment, there is no measurement for sleeve length or width.
※ Height, bust, and waist measurements are for reference only.
Size Selection Guide
- Standard to slightly slim build: Choose based on your usual size.
- Well-built physique: For a more comfortable fit, we recommend choosing one size up.
- Muscular or broad-chested: Consider going up one size to ensure ease of movement around the chest and arms.
Precautions for Use
- This product is not medical equipment.
- This product is clothing designed to reduce sun exposure on the skin and body. It is not intended to prevent or treat any medical condition, and it does not guarantee complete protection against sunburn or skin irritation.
- This product is clothing and does not prevent or improve stains, wrinkles, or skin sagging.
- The relationship between near-infrared rays and photoaging (wrinkles, sagging) is still being researched and is not a settled conclusion.
- UPF 50+ is based on testing of the fabric by a third-party testing organization. Test data on near-infrared rays is currently being measured.
- When active under a hot sun, please take appropriate heat-protection measures in addition to wearing this product, such as frequent hydration, resting, and wearing a hat.
- Avoid using a tumble dryer.
- If you experience any skin abnormalities or discomfort while wearing the product, discontinue use immediately.
- Do not use or store near open flames.
- Avoid storing in high-temperature, high-humidity, or direct sunlight.
- Do not use while sleeping.
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