Core Shield Men's Long-Sleeve Inner Layer, Loose Fit, Covers Back of Hands | Near-Infrared Absorbing Fabric, UPF50+
Tailored to standard Japanese sizing for a sleek, zero-bulk base layer fit. If you are between sizes or prefer a more relaxed fit, we recommend sizing up one size.
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Please select a size and color before adding to cart.
- 100% Made in JapanAuthentic Japanese textile engineering, shipped directly from Japan.
- Tracked EMS to the UAEArrives in about 7–10 business days. Free shipping on orders of ¥15,000 or more (approx. AED 350, converted at checkout). No import duty on orders under AED 1,000; 5% UAE VAT may be collected on delivery.
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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. 1,130 THB (about 46% 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.
Next shipment is scheduled for 2027 or later
Once current stock is depleted, this item will be unavailable until the next production run. Please check size and color availability early.
What sunscreen protects against is
only about 5% of sunlight.
The remaining approximately 42% is near-infrared radiation. CORE SHIELD® uses Trubeaute®, a functional fiber that absorbs near-infrared rays while also offering UPF50+ UV protection found in sunlight. It features long sleeves that reach the back of the hands and a relaxed fit that reduces constriction. This single layer covers you from the back of the neck and back down to the back of your hands, without the need for reapplication.
Choose the style that suits you
CORE SHIELD® men's long-sleeve innerwear is available in two different styles with the same functionality. The fabric, material, and sun-protection properties are identical. The difference lies in the "fit" and "sleeve length." This is the "relaxed fit" type, designed for comfort and coverage reaching the backs of the hands.
| Category | Relaxed Fit (This product) | Trim Fit |
|---|---|---|
| Fit | Soft fit with minimal constriction | Trim fit that naturally follows the body |
| Sleeve Length | Extra length reaching the backs of the hands | Standard length to the wrists |
| Sizes | S–2XL (approx. height 162–188cm) | S–XL (approx. height 157–178cm) |
| Best for | Those who want a relaxed fit / hand coverage | Those who want a trim fit / to minimize excess fabric |
※Sun-protection functions (UV protection, near-infrared protection, moisture-wicking/quick-drying, and cool-touch) are the same for both types. The Relaxed Fit is popular for gardening or daily errands, while the Trim Fit is favored for golf or outdoor work requiring active movement.
Designed for active men and the areas you want to protect
"The back of my neck gets burned," "My back shows when I bend over," "The fabric bunches up around my shoulders during swings or work," "It feels tiring after wearing it for a long time." CORE SHIELD men's innerwear addresses these real outdoor discomforts, aiming to block the sun while allowing for natural, unrestricted movement.
Mock neck raised at the back to cover the nape
In golf addressing postures or outdoor work, the back of the neck is continuously exposed to sunlight. The mock neck, which is higher at the back, protects the area most prone to sunburn.
Longer hem prevents it from coming untucked
The long length ensures your back doesn't show when you bend over. It stays tucked in, reducing distractions during play or work.
Sewing pattern designed for shoulder and arm range of motion
Considers movement from the armpits to the arms to prevent tension during swings, practice, or raising your arms, allowing for easy shoulder movement.
Extra-long sleeves and 3D design for hand coverage
The sleeves are extra-long to naturally cover the backs of the hands, which are prone to sunburn outdoors. The 3D sleeve design follows the bending, stretching, and twisting of your arms to minimize discomfort.
Gentle fit for long-lasting comfort
Reduced-constriction design minimizes pressure on the body. It provides a comfortable fit for a wide range of body types, even during long outdoor activities.
Sunscreen only addresses about 5% of sunlight
Of the solar energy that reaches the Earth's surface, UV rays account for about 5%. The remaining 42% is near-infrared radiation. Near-infrared rays have longer wavelengths than UV rays and are noted for reaching deep into the skin.
SPF, PA, and UPF are all indicators of UV protection. There is no standard for evaluating infrared rays. Those who spend long hours in the sun need protection against near-infrared rays in addition to UV rays.
※Based on the reference solar spectrum (AM1.5 global irradiance/surface) according to ASTM G173-03. Values may not sum to 100% due to rounding.
Trubeaute®: Functional fiber that blocks UV and near-infrared rays
Trubeaute® is a functional material that combines yarns infused with special ceramic microparticles derived from rare metals, developed by Sumitomo Metal Mining Co., Ltd., which absorb near-infrared rays, and yarns infused with titanium oxide, which reflects UV rays.
- Near-infrared-absorbing yarn: Infused with special ceramic microparticles derived from rare metals, which are also used in heat-shielding films for buildings and car windows.
- UV-reflecting yarn: Combined with yarns infused with titanium oxide for UPF 50+ UV protection (tested on fabric alone).
- Fiber-integrated technology: Because the functional components are inside the fiber, they won't wash off with sweat, and no reapplication is necessary.
Why it's chosen by those who spend time in the sun
Blocks 87%+ of near-infrared rays
Accounting for about 42% of sunlight reaching the Earth, near-infrared light has a longer wavelength than UV rays and is noted for reaching deep into the skin. This fabric blocks the spectrum that sunscreens and standard UPF-rated clothing do not cover (tested on fabric alone).
Blocks 97%+ of UV rays / UPF 50+
UPF 50+ UV protection. Protects your skin during golf, running, fishing, outdoor work, and other activities involving long-term sun exposure (tested on fabric alone).
Moisture-wicking and quick-drying, stays off your skin
Absorbs a water drop in 2 seconds, with 3.8% residual moisture after 60 minutes (Black, tested on the fabric alone). It stays light even when you sweat, reducing stickiness and cling.
Cool-touch technology for immediate comfort
A cool-to-the-touch feel that's delightful in hot weather. It stays comfortable and dry-feeling even during sweaty seasons, even when layered.
Recommended for
Golf, Running, Fishing
A round of golf lasts about 4–5 hours, and there's almost no shade on the course. Perfect for those who want to focus on their game or hobby without worrying about the sun.
Outdoor work, Gardening, Daily Errands
Great for long hours of outdoor work, driving, walking, or gardening. The go-to layer for those who spend long periods under the sun.
Made in Japan | Quality you can trust for your skin
Since this innerwear touches your skin directly, we do not compromise on quality. This is a purely domestic product, with fabric production, sewing, and packaging all done within Japan. We use high-performance sewing machines similar to those used for swimwear, ensuring a focus on mobility, comfort, and durability.
Product Specifications
Size Chart & How to Choose
Actual Product Dimensions & Height Reference
Unit: cm. ※Height references are approximate.
| Size | Height (Men's) | Length | Width | Sleeve (from center) | Sleeve Width |
|---|---|---|---|---|---|
| S | 162–168 | 67.0 | 44.5 | 79.0 | 18.0 |
| M | 167–173 | 69.0 | 46.5 | 82.0 | 19.0 |
| L | 172–178 | 71.0 | 48.5 | 84.0 | 20.0 |
| XL | 177–183 | 73.0 | 50.5 | 86.5 | 21.0 |
| 2XL | 182–188 | 75.0 | 52.5 | 88.5 | 22.0 |
- Standard to Slim Build: Please choose based on your usual size.
- Broad or Muscular Build: Consider going one size up for better mobility around the arms and chest. Please note this may make the sleeves feel slightly longer.
- Long-duration wear (Golf/Outdoor work): If you are concerned about feeling constricted, choosing a slightly looser size is recommended for added peace of mind.
Precautions for Use
- This product is not medical equipment.
- This product is clothing intended 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 is not intended to prevent or improve dark spots, wrinkles, or skin sagging.
- Research on the relationship between near-infrared radiation and photoaging (wrinkles/sagging) is ongoing and has not reached a definitive conclusion.
- UPF 50+ is a test result conducted on the fabric by a third-party testing agency. Near-infrared protection rate: White 88.6% / Black 87.6% (average over 780–2600 nm, measured on the fabric alone by the material manufacturer). UV protection rate: White 97.1% / Black 98.7% (UPF 50+).
- When active under the blazing sun, please take appropriate heat-countermeasure steps in addition to wearing this product, such as frequent hydration, resting, and wearing a hat.
- Avoid using a tumble dryer.
- If you feel any irritation or the product does not suit your skin, discontinue use.
- Do not use or store near open flames.
- Avoid storage in hot, humid locations or in direct sunlight.
- Do not wear while sleeping.
Before you buy
Will the UV and near-infrared protection wash out over time?
No. Unlike coated fabrics or sprays, the protection is built into the yarn itself. The near-infrared absorbing particles are kneaded into the fiber, so they do not peel off in the wash.*
*Based on the fiber maker’s specification for Trubeaute®. This is not a wash-durability test result for the finished garment.
Can I wear this comfortably under golf polos, work shirts, or modest wear?
Yes. The ultra-thin, quick-drying Japanese fabric is designed as an invisible base layer. It wicks sweat quickly and helps reduce heat buildup without adding bulk.
Where does my order ship from, and can I track it?
All orders are packed in Japan and shipped directly to your door by tracked EMS (Japan Post international express mail). You will receive a tracking number by email as soon as your order ships.
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