The New Balance Athletics Heat Grid 1/2 Zip men's running longsleeve enhances comfort during training in cooler conditions thanks to NB HEAT technology, which supports thermal regulation and moisture wicking. Made from recycled polyester and elastane, it offers flexibility and quick drying, while the partial zip and stand-up collar make it easy to adjust ventilation during intense exercise.
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Men's running longsleeve New Balance Athletics Heat Grid 1/2 Zip dark shoreline (MT43204DAK.M)
The New Balance Athletics Heat Grid 1/2 Zip dark shoreline men’s running longsleeve redefines training comfort by combining advanced thermal regulation technology with an eco-friendly approach to materials. Its functional design provides support during intense effort, offering optimal breathability and comfort even during dynamic pace changes.
NB HEAT technology for effective thermoregulation
The base layer in this model is created by NB HEAT technology, which effectively manages moisture and retains heat close to the body, ensuring optimal temperature maintenance during training in cooler conditions. The sweat-wicking system supports a dry microclimate, allowing full freedom of movement while running. The 1/2 Zip allows precise ventilation, making it easy to quickly adjust the cooling level to your needs.
Eco-friendly recycled materials
The New Balance Athletics Heat Grid 1/2 Zip is made from fabric consisting of 95% recycled polyester and 5% elastane, providing flexibility and increased resistance to deformation. The use of recycled materials emphasises the product’s environmentally friendly character without compromising functionality. The addition of elastane ensures freedom of movement and a better fit to the wearer’s silhouette.
Functional details and fit
The stand-up collar with a partial zip allows additional neck protection adjustment and easy putting on and taking off of the longsleeve. Practical zippered pockets enable secure storage of small items while running. The slim fit cut and long sleeves provide comfort and ergonomic support at every stage of training.
New Balance Athletics Heat Grid 1/2 Zip dark shoreline men’s running longsleeve – features:
- Advanced NB HEAT technology for effective body temperature regulation;
- Made from 95% recycled polyester and 5% elastane for eco-friendliness and flexibility;
- Precise ventilation thanks to a practical 1/2 Zip;
- Slim fit cut allowing full freedom of movement;
- Long sleeves and stand-up collar enhancing comfort in cooler conditions;
- Zippered pockets providing secure storage for small items;
- Highly breathable fabric supporting moisture wicking;
- No compression seams for a natural fit on the body;
- Designed for running in varied weather conditions;
- Environmentally friendly construction through the use of recycled materials.
Product Details

1/2 Zip Lock supporting ventilation
Temperature regulation during running becomes easier thanks to the use of a 1/2 Zip. By opening or closing the zip, the user can precisely control the amount of air entering under the clothing during increased activity. In the event of a sudden rise in heat, a quick hand movement is enough to increase ventilation and maintain optimal conditions during training.

Long sleeve protecting against chafing
Protection against chafing during training is provided by long sleeves that cover the arms and forearms during intense movements. The specially designed cut does not restrict the range of arm motion, even with dynamic changes in pace or running direction. As you cover the kilometres, the fabric effectively separates the skin from direct contact with the ground or clothing elements, minimising the risk of irritation.

Slim fit cut tailored to the silhouette
The silhouette gains a clear contour thanks to the tailored slim fit cut, which follows the body's line with every movement. The garment does not create folds or interfere with dynamic changes of pace, eliminating the feeling of excess fabric while running. This solution ensures that every workout proceeds without distractions, and the clothing looks modern in sporting conditions.
Warm
I use it for running in the current temperatures (-5/5). Without wind it is sufficient. If it is windy I put on a waistcoat. It does the job.
Ideal for the current weather (-5)
Superbly made, warm and visible. Highly recommended!
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Men's running longsleeve New Balance Athletics Heat Grid 1/2 Zip dark shoreline
Men's running longsleeve New Balance Athletics Heat Grid 1/2 Zip dark shoreline
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