Why Proper Fit Matters

A helmet that does not fit correctly is a liability. Too loose, and it shifts during movement, creating coverage gaps and obscuring vision. Too tight, and it causes pressure points, headaches, and distraction. An improperly fitted helmet also fails to distribute impact energy correctly across the suspension system, reducing the protection it provides. Taking 15 minutes to fit your helmet properly is one of the highest-return investments you can make in your protection.

Taking Measurements

You need two measurements to determine your helmet size:

  1. Head circumference: Using a soft measuring tape, measure around your head approximately 1 inch (2.5 cm) above your eyebrows and ears, across the widest point at the back of your head. Keep the tape level. Measure three times and use the average.
  2. Fore-aft measurement: Measure from the center of your forehead (at the brow line) over the top of your head to the occipital protuberance. The bony bump at the back of your skull. This measurement helps distinguish between round and oval head shapes at the same circumference.
STANDARD HELMET SIZE CHART ----------------------------------------- Size Circumference Typical Fit XS 20.0 - 20.5" (51 - 52 cm) S 20.5 - 22.0" (52 - 56 cm) M 22.0 - 23.0" (56 - 58.5 cm) L 23.0 - 24.0" (58.5 - 61 cm) XL 24.0 - 25.0" (61 - 63.5 cm) NOTE: Sizing varies by manufacturer. Always consult the specific product size chart.

Pad Placement

Modern tactical helmets use pad suspension systems rather than web slings. Correct pad placement is essential for both comfort and protection:

  • Crown pad: Center it on top of the head. It should make firm, even contact with the crown of your skull. This is the primary impact-absorbing pad.
  • Front pad: Position across the forehead. The bottom edge should sit approximately 1 inch above the eyebrows. This pad also anchors the helmet's position on your head.
  • Temple pads (lateral): Position at the squarial arch. The area above and forward of the ears. These should make even contact without pressing on the temple arteries, which can cause headaches during extended wear.
  • Occipital pads (rear): Position to cradle the occipital bone at the back of the skull. These pads are critical for fore-aft stability and prevent the helmet from rocking forward when head-mounted accessories add front weight.

Gaps between the head and pads should not exceed 0.5 inches. If gaps exist, add or rearrange pads to achieve full contact. Most helmet systems include multiple pad sizes and configurations for this purpose.

Retention System Adjustment

The retention system keeps the helmet on your head during impacts, blasts, and rapid movement. Adjust in this order:

  1. Position the chin cup centered under your chin, not on the throat or the lower jaw. The cup should cradle the chin bone.
  2. Adjust the front straps so they pass just forward of the ears without pressing against the ear.
  3. Adjust the rear (nape) strap to sit at the base of the skull, just above the neck. This is the primary strap that prevents the helmet from rotating backward off the head.
  4. Tighten until snug. You should be able to fit one finger between the chin strap and your jaw. The helmet should not shift when you shake your head vigorously side to side.

NVG and Counterweight Balance

Night vision goggles and other front-mounted accessories shift the helmet's center of gravity forward, creating neck strain and causing the helmet to rotate downward over the eyes. Counterweights on the rear of the helmet restore balance:

  • Start with a counterweight equal to approximately 50-75% of the front-mounted accessory weight
  • Position the counterweight as low as possible on the rear of the helmet to maximize the moment arm
  • Adjust the counterweight until the helmet sits level without requiring you to actively hold your head back
  • Re-check retention strap tension after adding counterweights, as the altered weight distribution may change strap loading

Battery packs for helmet electronics can serve double duty as counterweights if positioned on the rear of the helmet. This reduces total accessory weight while solving the balance problem.

Final Comfort Check

After fitting, wear the helmet for at least 30 minutes while performing your normal activities. Check for:

  • Pressure points (hot spots that will become painful over hours)
  • Vision obstruction (the brim should not enter your field of view when looking straight ahead)
  • Hearing interference (the helmet should not press against ear protection or communication headsets)
  • Stability during rapid head movement, climbing, or prone position
  • Compatibility with eyewear (ballistic glasses or goggles should seal against the face without being pushed by the helmet)

If any issues are found, address them before field use. Small adjustments during fitting prevent major problems during operations.