Rashguard Hem Keeps Riding Up? Here’s the Real Fix
There is a moment about four minutes into a hard round when your rashguard tells you the truth. You’ve been scrambling, someone’s weight has been driving through your chest, and now the hem has crept up over your ribs and stayed there. This is the single most common rashguard complaint in no-gi, and it’s also the most commonly misdiagnosed. For the full standard on how a rashguard should fit everywhere else — sleeves, collar, seams — see our complete no-gi rashguard fit guide. This piece is about one narrow, specific failure: the hem that won’t stay down.
It’s Almost Never a Length Problem
The instinct when a hem rides up is to blame the length — “this rashguard is too short.” Length is rarely the real culprit. A rashguard rides up because the torso is too loose, not too short. When the trunk of the garment doesn’t grip your midsection, there’s nothing anchoring the hem, so the first time someone drives into your guard the whole thing telescopes upward and stays there. A too-short rashguard and a too-loose rashguard produce the same symptom, which is exactly why this gets misdiagnosed and people buy a longer size when what they needed was a tighter one.
The Test That Tells Them Apart
Reach both arms straight overhead and hold. A little lift is normal and unavoidable — the fabric has to travel with your ribcage. What you’re actually checking is whether the hem retracts on its own the moment you lower your arms. If it drops back into place, the torso is gripping correctly and you don’t have a problem. If it stays bunched around your ribs after your arms come down, the torso isn’t holding tension against your skin, and sizing down — not up — is the fix.
There is one genuine length issue worth separating from this, though: torso length versus torso circumference. Tall, lean grapplers often buy the size that fits their chest and end up with a rashguard that’s the right tightness but simply too short from shoulder to hip. If your rashguard grips well everywhere but still exposes your lower back the moment you bend forward — not just when your arms go up — that’s a proportion problem, not a looseness problem, and the fix is a brand’s “tall” or “long” cut rather than a bigger standard size.
Why It Matters More Than It Sounds
A riding hem isn’t just annoying to re-tuck between exchanges. It exposes your lower back to direct mat contact during scrambles and inversions, and the bunched fabric it leaves at your ribs is exactly the kind of loose material an opponent’s forearm or knee can catch and use to control your posture. In a sport built on the idea that there’s nothing to grip, a rashguard that rides up quietly reintroduces a handle.
The quick diagnostic sequence: reach overhead and watch for retraction, then bend forward at the waist as if shooting a takedown and check whether your lower back stays covered. The first test isolates a torso that’s too loose. The second isolates a torso that’s too short. Most riding hems fail the first test, which means the fix sitting in your gym bag is almost always a smaller size in the same cut — not a longer one.
Ready to replace a rashguard that won’t stay put? Compare no-gi compression tops with flatlock seams and a proper athletic cut here: shop no-gi rashguards on Amazon.
