Yes. Rashguards protect your skin from mat burn, reduce the risk of skin infections, and keep sweat from sticking to you or your partner. They’re tight, breathable, and built to stay in place when you move — way better than a loose T-shirt during rolls.

Quality rashguards don’t fade after the first wash, don’t get those annoying fabric “pills,” and don’t stretch out. Look for double-layer panels, good stitching, and a rubber waist band so it doesn’t ride up every time you invert or scramble.

It should be snug — like a second skin, not a sausage casing. Tight enough to stay put when you bridge or shoot, but still flexible to breathe and move. If you’re between sizes, most people size down for training and competition.

Both are fine. Spats offer more coverage, protect your legs from mat burn, and keep sweat off your training partners. Shorts alone work too — just make sure they’re made for grappling, with stretch, strong seams, and no pockets or zippers.

Most tournaments require ranked rashguards or plain competition colors with no pockets, zippers, or loose clothing. If you plan to compete, check the event rules before buying, but a clean rashguard and shorts from a proper BJJ brand will keep you safe and legal.

Most competitions don’t require a rashguard under the Gi jacket, but many people still choose to wear one. A rashguard helps with sweat, comfort, skin protection, and prevents the Gi from sticking to you. It must be short-sleeve or long-sleeve, tight-fitting, and usually in your belt rank color if the event follows stricter rules. Always check the tournament rules beforehand — some allow any color, some want belt rank colors, and IBJJF likes ranked tops, but you won’t be disqualified just for wearing a rashguard unless the rule set specifically bans it.