STX Cell IV Arm Guard: How to Choose, Fit and Wear It Correctly

Updated November 2026

The STX Cell IV arm guard is a forearm protector built for archers and other sports where a bowstring or string hand can strike the inside of the bow arm. This guide explains how to confirm the guard fits your arm, how to position and secure it, and how to check it over time so it keeps doing its job. By the end, you should be able to strap one on in under a minute and know whether it is protecting you properly.

What the STX Cell IV Arm Guard Is Designed to Do

An arm guard, sometimes called a bracer, covers the inside of your bow forearm. Its main job is to keep the bowstring from slapping bare skin when you release, and to stop your sleeve from catching on the string during the shot. Some archers also use a guard to keep the string from making noise, which can matter in hunting or in quiet indoor ranges.

Shopping for one? See our guide: Maverik Max Arm Guard Review (2026): Features and Performance.

Guards in the Cell line use a padded or contoured shell with adjustable straps. Manufacturers generally describe the Cell IV as a sport-style guard with a shaped plate and a secure closure, intended to stay in place through a full shooting session. Check the product packaging or the manufacturer’s sizing chart for exact dimensions and materials, since those details can vary between production runs.

Step 1: Measure Your Forearm Before You Buy or Adjust

Fit matters more than brand. A guard that is too short will leave skin exposed near the wrist or elbow, and one that is too long can rub or slide. Measure your bow arm before you order or try one on.

1. Stand with your bow arm extended straight out at shoulder height, as you would at full draw, but relaxed.
2. Measure from the bony point of the wrist to the point of the elbow along the inside of the forearm, using a flexible tape.
3. Measure the circumference of your forearm at the widest point just below the elbow.
4. Write both numbers down and compare them with the sizing chart from the manufacturer. If you fall between sizes, most archers do better with the slightly larger size, since you can tighten a strap but cannot stretch a shell.

Your bow arm can change slightly with muscle development, so recheck the measurement if you have been training hard or if your draw technique has shifted.

Step 2: Position the Guard Correctly on Your Arm

Good positioning covers the inside of the forearm from the wrist to just below the elbow crease, with the shell centered over the area the string travels across. A guard set too far toward the wrist leaves the mid-forearm exposed, while one set too high can press into the elbow and restrict movement.

Find the Centerline

Hold your bow in your normal stance and let your arm hang naturally. The string path crosses the inside of your forearm roughly at the center line. Place the guard so its center sits on that line, not on the outer edge of your forearm.

Check the Wrist and Elbow Ends

The lower edge should sit an inch or so above the wrist bone so it does not interfere with your bow hand. The upper edge should clear the elbow crease. If you can feel the plate digging into the inside of the elbow when you bend it, move the guard down slightly.

Step 3: Secure the Straps Without Restricting Circulation

Straps should be snug enough that the guard does not shift when you draw, but loose enough that you can slide one finger under each strap. If your hand tingles, feels cold, or changes color after a few minutes, loosen the straps. Numbness or tingling that persists after you take the guard off should be checked by a doctor.

1. Fasten the lower strap first, nearest the wrist, and pull it firm enough to hold the guard in place.
2. Fasten the upper strap next, closest to the elbow.
3. Draw your bow to your anchor point and hold for a few seconds. Watch whether the guard shifts toward your wrist or elbow.
4. Release and check the skin underneath for pressure marks. Light redness that fades quickly is normal. Deep marks or blisters mean the strap is too tight or the shell is poorly aligned.

Step 4: Test the Fit With Real Shots

A guard can look right standing still and still fail once you start shooting. Shoot a set of arrows at a short distance and pay attention to three things: whether the string touches the guard in a consistent spot, whether the sleeve or shirt is pulled into the string path, and whether the guard moves when you release.

Consistent string contact on the shell is what you want. Random contact on the edge of the plate or on your bare skin means the guard is out of line. Adjust the position in small steps and shoot again rather than making large changes all at once.

Step 5: Clothing and Setup Considerations

What you wear underneath affects how the guard performs. Long sleeves can help keep the guard from rubbing, but a sleeve bunched under the strap can create pressure points. Choose a shirt that stays flat under the guard and does not catch on the string. Some archers prefer a thin, snug sleeve; others shoot bare-armed with the guard directly on the skin. Either works if the fit is right.

Check that the guard does not interfere with your draw length or anchor. If you use a sight or stabilizer, make sure the guard clears them through the full draw cycle.

Step 6: Inspect and Care for the Guard Over Time

Straps wear out, buckles loosen, and the shell can crack or warp after repeated impacts or after sitting in a hot car. Inspect your guard before each session.

• Check for cracks, deep scratches, or softened spots on the shell.
• Test each strap by pulling on it. Any fraying, stretched elastic, or slipping closure means replacement is due.
• Wipe the guard and straps with a damp cloth after shooting to remove sweat and dirt.
• Let the guard air dry away from direct heat, and store it flat or hung so the shell keeps its shape.

Common Mistakes

• Buying by guess instead of measurement. A size that looks right in a store can ride up or slide once you draw.
• Cinching the straps too tight. Tight straps cause pressure marks and can make your hand feel numb.
• Ignoring string contact. If the string hits your skin beside the guard, the plate is misaligned.
• Keeping a damaged guard. A cracked shell may stop protecting you at the exact moment you need it.
• Forgetting to recheck after changes. A new bow, a different string, or a change in draw length can shift where the string travels.

Tips for New Archers

• Set the guard up on the first session, then take a photo of the position so you can reproduce it later.
• If you shoot in a group, ask an experienced archer to watch your string path for a few arrows.
• Pair your guard with a good understanding of your bow’s draw length. Our piece on Recurve Bow Arm Guard: How to Choose, Fit and Wear One Correctly covers related fitting ideas for other bow types.
• If you are comparing guards for a different sport or style, the article Traditional Archery Arm Guard: 3 Best Picks for Target Archers (2026) offers a useful contrast in construction.
• For a longer coverage option, see Long Archery Arm Guard: How to Choose, Fit and Use One Properly, and for those who need extra length, Extra Long Archery Arm Guard: How to Choose the Right Length and Fit goes into sizing in more detail.
• Women archers should also review Women's Archery Arm Guard: How to Choose and Fit One Properly, since forearm shape varies and some guards are cut differently.

Recommended Gear

A few supporting items can make the setup easier and more consistent.

• A flexible tape measure. Useful for checking forearm length and circumference before ordering. View on Amazon
• A bowstring silencer or serving protector. Reduces string noise and cushions the string if it strikes the guard edge. View on Amazon
• A small bow care kit with cloth and wax. Helps keep the string and bow in good condition, which in turn keeps string path consistent. View on Amazon

FAQ

How tight should the STX Cell IV arm guard be?

Snug enough that it does not shift when you draw, but loose enough that you can slide a finger under each strap. Numbness or color change in your hand means it is too tight.

Where should the guard sit on my forearm?

Centered over the string path on the inside of the forearm, with the lower edge above the wrist bone and the upper edge clearing the elbow crease.

Should I wear a shirt under the guard?

It is a matter of preference. A flat, snug sleeve can reduce rubbing, but make sure no fabric bunches under the straps or catches on the string.

How do I know if my guard is the right size?

Measure your forearm length and circumference and compare them with the manufacturer’s sizing chart. If you fall between sizes, the larger one is usually easier to adjust.

Why does the string still hit my arm?

The guard is likely misaligned or too small. Re-center it on the string path and check the coverage at both ends. If it still happens, the size may be wrong.

How often should I replace the guard?

Replace it when the shell cracks, the straps stretch or fray, or the closure no longer holds. There is no fixed interval; inspection before each session is the best guide.

Can I use this guard for other sports?

Guards in this style are primarily designed for archery. Check the manufacturer’s stated uses before using it for another activity.

Should I see a professional about arm or wrist discomfort?

Yes. Persistent numbness, tingling, swelling, or pain in the arm or hand should be evaluated by a doctor or physical therapist, not treated by adjusting the guard alone.

Conclusion

A well-fitted STX Cell IV arm guard protects your forearm and keeps the string path consistent. Measure before you buy, position the shell over the string line, and set the straps by feel rather than by force. Inspect the guard regularly, and recheck the fit whenever your equipment or draw changes.

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