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The Mizuno RB 4.5 SHORT is the ultra-light men's running short for those who never stop. 100% Polyester fabric (118 gsm/sqm) with breathable inner, zippered back pocket and reflective details for night running — in Black for a technical and versatile look.
Technical Features
- Composition: 100% Polyester
- Lightweight and high-performance outer fabric with breathable inner
- Zippered back pocket
- Reflective details for visibility in night running
- Weight: 118 gsm/sqm — ultra-light
- Length: 4.5 inches (short fit)
Ideal If...
- You are looking for ultra-light black men's running shorts for summer training and races
- You need a secure zippered pocket for keys or energy gels
- You run in the evening and want guaranteed visibility from reflective details
- You prefer black for a technical look that matches any top
Fit and Sizing
The RB 4.5 SHORT offers a loose and non-compressive fit, ideal for those who prefer total freedom of movement. The 4.5-inch length makes it shorter than mid-length models. Compared to Nike or Asics in the same range, Mizuno tends to cut slightly tighter at the waist: if you are between two sizes, choose the larger one. Available from M up to 3XL.
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Care and Maintenance
Wash at 30°C with similar colors. Do not use fabric softener. Do not tumble dry to preserve the technical properties of the fabric.
Why Choose Mizuno
Mizuno is a Japanese brand with over 120 years of history in the sports world. The Running Body line is designed for athletes seeking the perfect balance of lightness, performance, and functionality — with technical materials developed for the most demanding runners.
FAQ
Is the black Mizuno RB 4.5 SHORT suitable for road running?
Yes, it is specifically designed for road and mixed-terrain running, with ultra-light and quick-drying fabric.
Is the zippered pocket large enough for a smartphone?
The back pocket is designed for small items such as keys, energy gels, or earphones. For a smartphone, we recommend a dedicated armband.
Is the Mizuno U2EBB568 09 short available in large sizes?
Yes, it is available up to size 3XL — great for those looking for men's running shorts in larger sizes.
What is the difference between the Black model and the Blue model?
Same fabric and same technology, different color. Black is more versatile and easy to match, while Blue offers a more sporty and vibrant look.
How should I wash the Mizuno running shorts?
Wash at 30°C, without fabric softener and without tumble drying to maintain the technical properties of the fabric.
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