The Ultimate Hybrid Layer for High-Heat Adventures

Specifically designed for those who want the freedom of a t-shirt without sacrificing sun protection or cooling performance. This hybrid base layer combines two technical fabrics to create a "built-in arm sleeve" effect, making it the perfect choice for trekking, cycling, or travel in hot, sunny conditions.

Specifications

• Style Number: #1107846

• Material (Body): ZEO-LINE® Cool Mesh (100% Polyester) Features: Micro-bumpy texture for air circulation and silver-ion anti-bacterial treatment.

• Material (Sleeves): Ultralight High-Stretch Fabric (Approx. 79% Nylon + 21% Polyurethane)

  • Features: Designed for UV protection and evaporative cooling.

• Weight: 69g – Extremely lightweight and packable.

• Construction: * Flat Seam Technology: Eliminates bulk at the seams to prevent chafing under backpack straps.

• Spiral Slant-Tec Cuff: Provides a non-restrictive, stretchy fit around the wrists that stays in place during movement.

• Fit: Slim-Fit (Designed to be worn close to the skin for maximum wicking efficiency).

• Color : Black, Light Gray

• Country of Origin: Vietnam / Thailand.

Key Technical Features

• Hybrid Cooling Construction: The body uses highly breathable ZEO-LINE Cool Mesh to vent heat and moisture, while the sleeves feature an ultralight, high-stretch fabric designed for maximum sun protection.

• Permanent Odor Control: Silver-ion treated fibers are woven directly into the fabric to neutralize odor-causing bacteria—essential for multi-day trips.

• Cling-Free Comfort: The body fabric features a "micro-bumpy" texture that prevents the shirt from sticking to your skin, even when you're working up a heavy sweat.

• UV Shielding Sleeves: Protect your arms from harsh trail sun without the hassle of separate arm warmers that can slide down or feel restrictive.

• Flat Seam Technology: All seams are pressed flat to eliminate bulk and prevent chafing, especially under the pressure of backpack shoulder straps.

Care & Maintenance Instructions

Technical fabrics like ZEO-LINE require specific care to maintain their moisture-wicking and odor-resistant properties.

Washing Instructions:

• Machine Washable: Use a Laundry Net. This prevents the delicate mesh and high-stretch sleeves from getting snagged or stretched by other garments.

• Water Temperature: Wash in cold or lukewarm water (below 40°C).

• Detergent: Use a mild, neutral detergent.

• CRITICAL: Avoid Fabric Softeners. Fabric softeners coat the synthetic fibers, clogging the mesh pores and destroying the shirt's ability to wick sweat and control odors.

• Bleaching: Do not use chlorine-based bleaches.

Drying & Ironing:

• Drying: Line Dry in the shade. The fabric is designed to be "Quick-Drying," so it will dry very fast naturally. Avoid direct sunlight for extended periods to prevent UV degradation of the elastic fibers.

• Tumble Dry: Avoid tumble drying if possible. If necessary, use the lowest heat setting (Delicate). High heat can damage the polyurethane fibers in the sleeves.

• Ironing: Do not iron. The material is naturally wrinkle-resistant. If absolutely necessary, use a very low heat setting with a pressing cloth.

Pro Storage Tip: When packing for a trek, roll the shirt rather than folding it to maintain the integrity of the "micro-bumpy" mesh structure. Since it’s so light, it can easily be tucked into a small corner of your pack or even a pocket.

Professional Tips from X-Boundaries

1. The "One-and-Done" Layering Hack: This piece is traditionally designed to be worn under a short-sleeve hiking shirt or a technical t-shirt. This gives you the look and airflow of a t-shirt but the UV protection of a long-sleeve. It’s significantly cooler than wearing a standard long-sleeve base layer.

2. Evaporative Cooling Boost: In extremely hot and dry conditions, lightly mist the sleeves with water. The technical fabric is designed to promote rapid evaporation, creating a localized cooling effect on your arms that feels like a portable air conditioner.
3. Perfect for High-Altitude Sun: As you climb higher, the UV rays become more intense. Even if it feels "cool" due to the wind, your skin is at risk. Use this shirt to keep your core from overheating during the ascent while ensuring your arms don't get sunburnt.

4. Fit for Function: Because this is a "Slim-Fit" model, it is meant to sit close to the skin. This ensures the ZEO-LINE mesh can effectively "wick" sweat away. If you prefer a looser fit for casual wear, consider sizing up, but for the best technical performance, stay with your true size.

5. Travel Light: At only 69g (2.4 oz), this is one of the lightest technical tops in your kit. It compresses down to the size of a lemon, making it an easy "just in case" layer to throw in your daypack for any sunny excursion.