Wear a welding cap under your helmet. It takes one spark landing on your scalp through the gap between your helmet and your head to learn this lesson the hard way. A proper FR welding cap costs $8-15, fits under any helmet without interfering with the headgear, absorbs sweat, and prevents hair ignition and scalp burns from spatter. The Comeaux 2000 series is the industry standard at $8-12, available in every size and dozens of patterns.
Hair catches fire easily. A single spark from grinding, a spatter ball from MIG, or a slag chip from stick welding lands in your hair and you’ve got a problem. The welding helmet covers the face and top of the head, but gaps exist around the edges, at the sides, and at the back. A welding cap fills those gaps.
Why Cotton Bandanas Are a Bad Idea
Some welders tie a cotton bandana around their head instead of wearing a proper cap. This is worse than nothing in certain situations. A loose bandana has edges that can dangle near the arc, catch fire, and burn against your scalp. The fabric isn’t FR-rated, so it sustains flame rather than self-extinguishing. The knot at the back creates a pressure point under the helmet headgear that causes headaches during long sessions.
A welding cap is specifically designed to fit snugly against the head, tuck under the helmet’s headgear without creating pressure points, and resist ignition from sparks. The bill, when present, is short and flexible enough to fold flat under the helmet brim.
Types of Welding Caps
Short Crown (Traditional Welder’s Cap)
The classic welding cap has a short crown that fits close to the head with a small, flexible bill. The bill shields the forehead and can be rotated to protect the back of the neck when the helmet is flipped up. This style fits under every welding helmet on the market.
The short crown design originated in shipyards and pipe shops where welders needed head protection that didn’t interfere with confined-space helmets. It’s remained the standard for 70+ years because the design works.
Skull Cap (No Bill)
A skull cap or beanie style with no bill at all. These fit closest to the head and provide the most clearance under tight-fitting helmets. No bill means no interference with the helmet in any position, but also less forehead protection when the helmet is up.
Skull caps work best for TIG welders and others who frequently flip the helmet up and down. The lack of a bill means the cap never catches on the helmet during transitions.
Extended Nape Cap
An extended nape cap has fabric that drapes down the back of the neck, providing UV and spatter protection for the neck area that the helmet doesn’t cover. This style is common among outdoor welders and pipe welders who work in positions where the back of the neck is exposed to the arc or to another welder’s arc nearby.
Top Welding Caps Reviewed
1. Comeaux 2000 Series - Industry Standard
Comeaux Caps has been making welding caps since 1955. Their 2000 series is the most widely worn welding cap in North America. It’s a short-crown design with a flexible bill, made from FR-treated cotton in a huge range of sizes and patterns.
| Spec | Comeaux 2000 |
|---|---|
| Material | FR-treated cotton |
| Style | Short crown, flexible bill |
| Sizes | 6-3/4 to 8 (fitted) |
| Patterns | 50+ options |
| FR Rating | ASTM D6413 compliant |
| Street Price | $8-12 |
Comeaux caps are sized like fitted baseball caps, by head circumference in inches converted to hat sizes. The fit is precise, which means the cap stays in place without shifting under the helmet. Order your exact hat size for the best fit.
The fabric is 10 oz FR-treated cotton that handles sparks and light spatter without igniting. The treatment lasts through 25+ wash cycles with proper care (cold water, no bleach). The variety of patterns is a Comeaux trademark, and many welders collect them.
2. Lincoln Electric K2994 Beanie
Lincoln’s K2994 is a skull-cap style beanie in FR cotton. No bill, low profile, fits under any helmet with zero clearance issues. It’s the simplest possible head protection for welding.
| Spec | Lincoln K2994 |
|---|---|
| Material | FR cotton |
| Style | Skull cap (no bill) |
| Sizes | S/M, L/XL |
| FR Rating | FR cotton |
| Street Price | $10-15 |
The two-size system (S/M and L/XL) is less precise than Comeaux’s fitted sizing but works for most heads. The FR cotton is comfortable against the scalp and absorbs sweat effectively. For welders who’ve never worn a cap and want to try one, the Lincoln beanie is a low-risk starting point.
3. Black Stallion AH1630-BK FR Cap
Black Stallion (Revco) makes an FR cotton cap with a short bill and a sweatband liner. The sweatband adds moisture management that plain FR cotton doesn’t provide, keeping sweat off the forehead and out of the eyes.
| Spec | Black Stallion AH1630-BK |
|---|---|
| Material | FR cotton with sweatband |
| Style | Short crown, bill |
| Sizes | 7 to 7-3/4 (fitted) |
| FR Rating | ASTM D6413 |
| Street Price | $10-14 |
The sweatband is the key feature. During sustained welding in warm conditions, sweat running into the eyes is a distraction and a safety hazard (it blurs vision behind the helmet lens). The absorbent band inside the cap catches sweat before it reaches the forehead.
4. Comeaux 3000 Series - Extended Nape
Comeaux’s 3000 series adds a nape drape to their standard short-crown design. The extra fabric extends 4-5 inches down the back of the neck, covering the area between helmet and collar where UV and spatter can reach.
| Spec | Comeaux 3000 |
|---|---|
| Material | FR-treated cotton |
| Style | Short crown, bill, nape drape |
| Sizes | 6-3/4 to 8 (fitted) |
| FR Rating | ASTM D6413 compliant |
| Street Price | $12-16 |
Pipe welders and outdoor structural welders are the primary users of extended nape caps. When welding overhead or in positions where the back of the neck faces another welder’s arc, the nape drape prevents UV burns on the neck. It also keeps spatter from going down the back of the collar.
Comparison Chart
| Feature | Comeaux 2000 | Lincoln K2994 | Black Stallion AH1630 | Comeaux 3000 |
|---|---|---|---|---|
| Style | Bill | Skull cap | Bill | Bill + nape |
| Material | FR cotton | FR cotton | FR cotton | FR cotton |
| Sizing | Fitted (precise) | S/M, L/XL | Fitted | Fitted (precise) |
| Sweatband | No | No | Yes | No |
| Neck Coverage | No | No | No | Yes (nape drape) |
| Price | $8-12 | $10-15 | $10-14 | $12-16 |
Sizing Your Welding Cap
Fitted welding caps are sized by hat size, which corresponds to head circumference.
Measure around your head at the widest point, about 1 inch above your eyebrows and ears. Use a flexible tape measure or a piece of string measured against a ruler.
| Head Circumference | Hat Size |
|---|---|
| 21-1/4" | 6-3/4 |
| 21-5/8" | 6-7/8 |
| 22" | 7 |
| 22-3/8" | 7-1/8 |
| 22-3/4" | 7-1/4 |
| 23-1/8" | 7-3/8 |
| 23-1/2" | 7-1/2 |
| 23-7/8" | 7-5/8 |
| 24-1/4" | 7-3/4 |
| 24-5/8" | 7-7/8 |
| 25" | 8 |
A welding cap should fit snugly without being tight. It needs to stay in place when you nod, lean, and flip your helmet up and down. Too loose and it shifts under the helmet, creating pressure points and gaps. Too tight and it causes headaches during long sessions.
Cap Care
FR welding caps require the same wash care as FR clothing. Wash in cold water with regular liquid detergent. No bleach, no fabric softener. Tumble dry low. The FR treatment on Comeaux and similar treated-cotton caps lasts approximately 25 wash cycles with proper care.
Replace caps when:
- The bill loses its shape and won’t hold position under the helmet
- The fabric is visibly thin or has holes from spatter
- The FR treatment has reached its rated wash cycle limit
- The elastic or headband is stretched out and the cap won’t stay snug
At $8-15 per cap, treat them as consumables. Buy 3-4 at a time, rotate through them, and replace as needed.
Wearing the Cap Under Your Helmet
The bill of a welding cap can face forward (forehead protection) or backward (neck protection). Most welders wear the bill forward for daily work and rotate it backward for overhead welding or when another welder is working nearby and their arc hits the back of your neck.
The cap should sit flat against your head with the helmet headgear sitting over the cap. Adjust your helmet’s headgear tension after putting on the cap, not before. Adding a cap under a helmet that’s already adjusted tight will create uncomfortable pressure.
Some welders find that a cap slightly changes the angle at which the helmet sits. This is normal. Readjust the helmet’s tilt and distance settings after adding a cap to your setup for the first time.
The Bottom Line
Buy the Comeaux 2000 for the best overall welding cap. Buy the Lincoln K2994 if you want a no-bill skull cap. Buy the Comeaux 3000 if you need neck protection for pipe or outdoor welding. Buy the Black Stallion AH1630 if sweat management is your priority.
A welding cap is the cheapest piece of PPE you’ll own and one of the most underrated. It prevents hair fires, scalp burns, and sweat in the eyes for $8-15. There’s no excuse not to wear one.
For more welding safety gear, see our guides on welding jackets, safety glasses, and respiratory protection. Browse the welding PPE hub for all our safety gear content.
Prices reflect typical street prices at time of writing and are subject to change.