Rash Guard vs T-Shirt for BJJ: Why Material Matters

The difference between a cotton tee and a proper rash guard is significant — for performance, hygiene, and your training partners' experience.

The Problem with Cotton

Cotton absorbs sweat and gets heavy, gives opponents grips, breeds bacteria, and wears out fast.

Why Rash Guards Are Better

Moisture-wicking: Pulls sweat away from skin. Compression fit: Nothing to grab. Flatlock stitching: No chafing. Anti-microbial: Reduces infection risk.

What to Look For

• Compression fit that doesn't ride up
• 80%+ polyester with 15-20% spandex
• Flatlock stitching throughout
• Reinforced stitching at stress points

A quality rash guard costs about the same as 3–4 t-shirts and will outlast all of them combined.