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The Mizuno RB SPLIT SHORT is the men's running short with side splits for maximum freedom of movement. Ultra-light 100% Polyester outer fabric (118 gsm/sqm) with an inner brief made of 92% Polyester / 8% Elastane and reflective details for night running — the ideal companion for those who never stop.
Technical Features
- Outer fabric: 100% Polyester — 118 gsm/sqm, ultra-light
- Inner brief: 92% Polyester, 8% Elastane — support and comfort
- Side splits for total freedom of movement
- Reflective details for visibility during night runs
- Lightweight and high-performance outer fabric with breathable inner
Ideal If...
- You're looking for men's running shorts with an integrated inner brief for maximum support
- You want side splits for a wide stride without restrictions
- You also run in the evening and want guaranteed visibility from reflective details
- You need plus-size men's running shorts (up to 3XL)
Fit and Sizing
The RB SPLIT SHORT offers a loose, non-compressive fit thanks to the side splits, ideal for those seeking total freedom of movement while running. The Elastane inner brief ensures support without external compression. Compared to Nike or Asics in the same range, Mizuno tends to cut slightly narrower at the waist: if you're between two sizes, choose the larger one. Available from L to 3XL.
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Maintenance and Care
Wash at 30°C with similar colors. Do not use fabric softener. Do not tumble dry to preserve the technical properties of the fabric and inner brief.
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
Does the Mizuno RB SPLIT SHORT have an inner brief?
Yes, the inner brief made of 92% Polyester and 8% Elastane ensures support and comfort without the need for additional garments.
Do the side splits limit the fit?
No, the side splits enhance freedom of movement without compromising coverage. They are designed for a wide and natural stride.
Is the Mizuno U2EBB565 short available in large sizes?
Yes, it is available from L up to 3XL — excellent for those looking for plus-size men's running shorts.
Are the reflective details sufficient for night running?
Reflectors increase visibility in low-light conditions. For intense night running, we recommend pairing them with a dedicated reflective vest.
How do I wash the Mizuno running shorts with inner brief?
Wash at 30°C, without fabric softener and without tumble drying, to maintain the technical properties of the fabric and the elastane of the brief.
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