A raw expression of humility and control, this design captures the inner battle every martial artist must face. At its center, the word OSU is reimagined — the O as a skull, the S as a lightning bolt, and the U as a coiled snake — symbolizing life, energy, and transformation. In martial arts tradition, OSU (also written OSS) dates back to the samurai spirit and represents perseverance, respect, and unwavering determination. It is spoken across dojos worldwide in Judo and Jiu Jitsu as a greeting, a sign of acknowledgment, and a reminder to endure. The skull and lightning signify that true strength begins only when the ego is overcome.

This t-shirt is everything you've dreamed of and more. It feels soft and lightweight, with the right amount of stretch. It's comfortable and flattering for all.

• 100% combed and ring-spun cotton (Heather colors contain polyester)
• Fabric weight: 4.2 oz./yd.² (142 g/m²)
• Pre-shrunk fabric
• Side-seamed construction
• Shoulder-to-shoulder taping
• Blank product sourced from Nicaragua, Mexico, Honduras, or the US

Disclaimer: The fabric is slightly sheer and may appear see-through, especially in lighter colors or under certain lighting conditions.

This product is made especially for you as soon as you place an order, which is why it takes us a bit longer to deliver it to you. Making products on demand instead of in bulk helps reduce overproduction, so thank you for making thoughtful purchasing decisions!

Size guide