Rash Guard Shirts and T-Shirts are both the option to wear beneath the BJJ Gi. However, the rash guard is more effective than t-shirts for protection and hygiene.
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Gold BJJ Foundation Women's Rash Guard - No-Gi and Gi Jiu Jitsu Rashguard for Women : : Clothing, Shoes & Accessories
What Should You Wear Under Your BJJ Gi: A Rash Guard Shirt Or A T
5 reasons why to wear a rash guard?
What Should You Wear Under Your BJJ Gi: A Rash Guard Shirt Or A T
Rashguard vs T-shirt: Which is safer for BJJ training? — Clube De
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