If you ride with locs, you already know the problem. Helmets are designed around a smooth, low-volume head. Locs are neither. You end up choosing between cramming everything under the shell, letting it hang out the back, or skipping the ride. None of those are good options, and two of them slowly wreck your hair.
Here's what actually works.
Why helmets damage locs in the first place
Three things are happening every time you put a helmet on.
Friction. The inside of a helmet is usually polyester or nylon liner fabric. Every time your head moves against it, the fabric grabs at the outer layer of your hair. Over months, that shows up as fuzz along the shaft, thinning at the roots, and frayed ends — especially on the crown and the back, where contact is heaviest.
Compression. Locs stuffed under a shell get pressed flat against your scalp. That's uncomfortable, it distorts the helmet's fit, and if you're doing it with a helmet sized for your bare head, you're also compromising the safety fit. A helmet that sits too high or rocks on your head isn't protecting you the way it was tested to.
Tension. The worst damage isn't from the ride — it's from pulling the helmet off. If your hair is caught in the liner, taking the helmet off yanks at your roots. Do that twice a day for a year and you'll see it at your hairline.
What riders actually do
Size your helmet with your hair in mind. If you have significant volume, go get fitted with your hair how you actually wear it. Don't buy online based on a measurement you took with your locs pulled back. A helmet should be snug with even pressure all around, with no hot spots and no rocking when you shake your head.
Put the length behind you, not under the shell. Forcing everything into the helmet is what causes the compression problem. The better approach is to contain the length behind your head, below the helmet line, where it isn't being crushed or flapping loose in the wind.
Put a smooth layer between your hair and the liner. This is the single highest-impact change. A low-friction barrier means your hair slides against fabric instead of catching on it. This is the same principle behind sleeping on a satin pillowcase — you're not protecting your hair from the pillow, you're protecting it from the friction.
Take the helmet off slowly and deliberately. Push the sides out with both hands rather than dragging it straight up off the back of your head. Most of the pulling damage happens in those two seconds.
What to stop doing
Don't ride with locs hanging loose outside the helmet. It looks good and it feels free, but wind at highway speed does real damage, and road grime and sun exposure both dry your hair out. It's also a snag hazard.
Don't use a regular cotton beanie or do-rag under the helmet. Cotton is high-friction and absorbs moisture instead of moving it. You'll end up with a wet, hot layer sitting against your scalp, which is its own problem on a long ride.
Don't retwist right before a long ride. Freshly retwisted roots are at their most fragile, and helmet pressure on tender roots is a fast track to tension damage.
The gear gap
Most balaclavas stop at the neck. They were designed for riders whose hair ends above the collar — which works fine if that describes you, and fails completely if it doesn't. That's the gap MEDUSA was built to fill: an extended balaclava with a rear drape long enough to fully contain locs, braids, or a bun behind the head, while the crown stays covered and the helmet sits exactly where it should.
The current version is sewn in a bamboo blend, which matters for two reasons. Bamboo's fiber surface is smooth, so it gives you the low-friction protection people usually go to silk for. Unlike silk, it also breathes and wicks moisture, which is what you need when you're sealed inside a helmet in July.
See the bamboo extended mask →
The short version
Get fitted with your actual hair. Contain the length behind your head rather than under the shell. Put something smooth between your hair and the liner. Take the helmet off gently. Do those four things and riding stops costing you hair.