One essential piece of protective kit often overlooked by newcomers—and appreciated by seasoned athletes—is the underarm protector, also known as a plastron. As a leading fencing equipment company, Prieur is committed to helping fencers of all levels stay safer, perform better, and comply with competition standards.
In this guide, we’ll cover who needs an underarm protector, why it matters, how to achieve a proper fit, and how to care for it so it lasts. You’ll also find internal and external resources for deeper learning and product comparison.
Who This Guide Is For
- Beginners entering their first fencing classes who are building a basic kit and unsure what a plastron does.
- Intermediate fencers who want to improve comfort, mobility, and safety during higher-intensity drills and bouts.
- Competitive fencers ensuring compliance with federation rules and maximizing protection against bruising and puncture.
- Coaches and club managers seeking durable, hygienic gear that’s easy to maintain and share across sessions.
These readers are typically looking for clarity on safety standards, the difference between men’s/women’s or left/right cut plastrons, sizing guidance, and care tips that preserve performance.
What Is an Underarm Protector (Plastron)?
An underarm protector—or plastron—is a sleeveless layer worn beneath the fencing jacket and over the base layer. Its purpose is to add extra puncture and abrasion resistance to the weapon arm, underarm, and lateral torso, especially on the weapon side where impacts are most likely. Modern underarm protectors come in single- or double-layer constructions and are offered in ambidextrous or handed designs.
Why Every Fencer Should Wear an Underarm Protector
1) Enhanced Safety and Impact Mitigation
Even with a jacket, the underarm and rib area can be vulnerable to thrusts, especially in foil and epee. A quality underarm protector adds another barrier to disperse force and reduce the chance of bruising and skin abrasion. For competitive fencers, an FIE-approved plastron provides elevated puncture resistance.
2) Compliance With Competition Rules
At sanctioned competitions, wearing an underarm protector is typically mandatory. Having the correct certification level (e.g., FIE 800 N for the plastron) helps you pass equipment control and avoid last-minute scrambles. Always check event regulations in advance.
3) Comfort and Confidence
A well-fitted underarm protector offers smooth layering under the jacket, minimizing hotspots and seam pressure. This comfort translates to better focus, cleaner technique, and more relaxed movement—especially during long training sessions or multi-bout days.
4) Longevity of Your Outerwear
By absorbing some of the sweat, friction, and impact, the plastron helps protect your jacket and lamé (foil/sabre) from excessive wear, indirectly extending the lifespan of your more expensive garments.
Choosing the Right Underarm Protector
Handed vs. Ambidextrous
- Handed plastron (left or right): Offers targeted coverage on the weapon arm side and is common for competitive fencers seeking an optimized fit.
- Ambidextrous plastron: Practical for clubs and beginners, as it can be used on either side and shared if needed.
Protection Level and Standards
- Training-level plastrons: Suitable for club practice and beginners, often lighter and more breathable.
- FIE-approved (e.g., 800 N) plastrons: Required for certain competitions; constructed for maximum puncture resistance and durability.
Tip: When in doubt, consider your competitive goals. If you plan to enter larger competitions soon, investing in an FIE-approved underarm protector may be worthwhile from the start.
Materials and Breathability
Look for moisture-wicking inner fabrics that manage sweat and reduce chafing. Multi-layer constructions can balance protection with ventilation. Some models integrate mesh panels in low-risk zones to improve airflow.
Size and Cut
Sizing typically aligns with jacket sizing, but always consult the brand’s specific chart and consider:
- Torso length: The plastron should cover the underarm, lateral ribs, and overlap with the waistband area without bunching.
- Armhole shape: Should allow full shoulder mobility without cutting into the deltoid or creating gaps.
- Seam placement: Flat or covered seams reduce friction under a snug fencing jacket.
How to Fit an Underarm Protector: A Step-by-Step Guide
1) Measure accurately
- Chest and underbust (or ribcage) circumference
- Shoulder breadth and torso length
Use these measurements against the specific product’s size chart.
2) Test range of motion
Put on your base layer, then the underarm protector. Raise and rotate your weapon arm as if lunging and recovering. There should be no pulling at the shoulder or collarbone.
3) Check coverage
Ensure the protector adequately covers the underarm and lateral rib area on your weapon side. Coverage should remain stable when you extend, parry, and recover.
4) Layer up
Add your fencing jacket (and lamé if applicable). Confirm no uncomfortable pressure points, that the jacket zips or buttons smoothly, and the layers lie flat.
5) Adjust or exchange if needed
If you feel rubbing at the neckline or excessive gaping in the armhole, consider a different size or model. Don’t compromise on mobility or coverage.
Care and Maintenance Tips
Proper care keeps your plastron hygienic, safe, and long-lasting.
- Wash frequency: After heavy training or competition days; otherwise every 2–3 sessions, depending on sweat and odor.
- Washing method: Follow the label. Most non-FIE and some FIE plastrons can be machine-washed on a gentle cycle in cold water. Use mild detergent; avoid bleach and fabric softeners (they can degrade protective fibers).
- Drying: Air-dry flat or hang in a well-ventilated area. Avoid tumble drying and direct high heat, which can weaken materials and warp shape.
- Deodorizing between washes: Lightly spritz with a sports fabric refresher or a 1:10 vinegar-to-water solution, then air out thoroughly.
- Storage: Keep fully dry. Store flat or hung to prevent creases. Avoid long-term compression under heavy gear.
- Inspection: Regularly check stitching, seam integrity, and any delamination or thin spots—especially in high-contact zones. Replace immediately if you notice compromised fabric.
Common Questions About Underarm Protectors
Do I need an FIE-approved plastron?
If you compete at events requiring FIE certification, yes. If you’re training recreationally or at local events, a non-FIE model may suffice. Check event rules.
Can I share a plastron at the club?
It’s possible with ambidextrous models, but for hygiene and fit, personal plastrons are best—especially for regular training.
Does a plastron restrict movement?
A correctly sized, modern underarm protector should not. If you experience restriction, revisit sizing or try a different cut.
How long does a plastron last?
With proper care, many fencers get several seasons of use. High-volume competitors or coaches may need more frequent replacement due to sweat and repetitive impact.
Safety and Standards: What to Know
- Many national federations and FIE rules mandate underarm protection at competitions. Double-check current regulations.
- FIE-approved plastrons are typically rated to 800 N puncture resistance. While no gear guarantees zero injury, adherence to standards significantly reduces risk.
For current rules and safety guidance, consult:
Why Choose Prieur for Your Underarm Protector
Prieur has outfitted fencers for generations, blending traditional craftsmanship with modern materials. Our underarm protectors are designed for:
- Optimized coverage on the weapon side without bulk.
- Breathable, durable fabrics that stand up to daily training.
- Precision sizing for youth and adults to ensure a confident fit.
- Options for both training and FIE-approved competition use.
Whether you’re purchasing your first plastron or upgrading for a new season, the Prieur range offers reliable performance and long-lasting comfort.
Internal Links to Explore
Conclusion: Gear Up with Confidence
A well-chosen underarm protector is a small investment with big returns—greater safety, better comfort, rule compliance, and extended life for your outerwear. By selecting the right fit, understanding standards, and following smart care practices, you’ll get the most from your plastron season after season.
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- Have a question about fit or certification? Contact our support team and we’ll help you choose the ideal underarm protector.