Do you need side armor plates? The question comes up for anyone building a plate carrier setup, whether for law enforcement, security work or personal use. The answer depends on the threat you assess, the work you do and what you can wear for a full day.
We found no NIJ or CJTTEC statement that requires side plates (checked 1 October 2026). This guide sets out what the sources say about side coverage, what to check on a side plate, and labels our own advice as ours.
Understanding side armor plates
Side armor plates are smaller plates worn at the sides of the torso, beside the front and back plates. In our view, they are usually carried in side pockets on a plate carrier's cummerbund; check the carrier maker's guidance for the plate sizes its pockets take.
The Army's Interceptor Body Armor is one documented example of side protection. According to the Army's 2012 Weapon Systems Handbook, Enhanced Side Ballistic Inserts (ESBI) add side plates to the outer vest, and the handbook lists the ESBI at 5.1 pounds per set. That is a military system, not law enforcement armor.
Side plates are made of the same material families as other hard plates: ceramic, steel and polyethylene, alone or in combination. We found no NIJ or CJTTEC source that ranks those materials for side plates by weight, thickness or performance (checked 1 October 2026). For what the materials are, read Materials Used in Armor Plates Explained.
When to consider side armor
Side coverage is part of how fit is checked. The Personal Armor Fit Assessment, a checklist excerpted from ASTM E3003 that BJA's Bulletproof Vest Partnership (BVP) FAQ points to, looks for a vest's sides to reach to within 3 inches of the armpit, and for the front and back panels to overlap by at least 2 inches of protective material. Those points are about how a vest fits, not about side plates.
In our view, side plates are worth considering when your assessment of the threat and your role call for covering the sides of the torso beyond what your front and back plates cover, and when you can carry the extra weight for the time you wear the armor. NIJ's selection guide walks agencies through assessing the protection they need.
For a military setting, see The Role of Body Armor in Military Applications.
Levels of protection
A side plate's level is the level its own model was tested to, under a named standard. NIJ certifies torso-worn ballistic armor for law enforcement model by model. Our advice: check the side plate's own record, the model, the standard and the level, and do not assume that the listing of the front plate it is worn with covers it.
Under NIJ 0101.06, Level III is tested against the 7.62mm NATO M80 round and Level IV against the .30 caliber M2 AP. Under NIJ 0101.07, the rifle levels are RF1, RF2 and RF3, defined in NIJ 0123.00; RF1 and RF2 share the M80, the 7.62x39mm MSC and the M193, RF2 adds the M855, and RF3 is the .30-06 M2 AP.
Where a buyer, policy or funder such as the BVP requires NIJ compliance, check the exact side plate model on the Compliant Products List (CPL), with the date you read it. Where it does not, check the standard the model claims and the test report behind it, from a lab whose report can be validated. "Level III+" is an industry term, not an NIJ level, and no standard defines the plus.
Some buyers choose a lower level for side plates than for their main plates to save weight. In our view, that is a trade-off to make knowingly: the sides are then tested against fewer rounds than the front and back. For more on the levels, visit Breaking Down Hard Body Armor Levels.
Comparing side and main plates
Main plates cover the chest and back; side plates are smaller and cover the sides. In our view, side plates fill part of the gap the main plates leave under the arms, but not all of it.
A side plate's level and a main plate's level are separate records. Check each model on its own, and compare the levels and standards they were tested to rather than assuming they match.
Choosing the right size
We found no NIJ or CJTTEC size range for side plates (checked 1 October 2026), and the live figure of 6x6 to 7x8 inches has no source, so we do not give one. Our advice: choose a size the carrier maker says its side pockets take, and that covers the side of your torso without stopping you from raising your arms or drawing. For more on plate sizing, refer to How to Properly Size Armor Plates.
Factors beyond weight and mobility
In our view, three other things matter: whether the side plate fits your carrier without interfering with other equipment, how quickly it can be removed or replaced, and the maker's care guidance and warranty. CJTTEC notes that manufacturer warranties are not evaluated by the Compliance Testing Program, and NIJ that performance can vary with storage, maintenance and use.
Pros and cons of using side plates
| In our view | |
|---|---|
| For | Covers part of the side of the torso that front and back plates leave open |
| Against | Adds weight and bulk; can make the carrier hotter and harder to conceal; can limit arm movement |
Every added piece adds weight, and armor too heavy to work in is more likely to be left off. Consider the carrier as well: read Exploring Different Types of Plate Carriers.
Conclusion
Whether you need side plates depends on the threat you assess, your role and what you can wear; no NIJ or CJTTEC source we found requires them. If you add them, treat each side plate as its own model: check the level and standard it was tested to, and, where NIJ compliance is required, the exact model on the CPL with the date you read it. Then check that your vest or carrier still meets the side coverage points in the Personal Armor Fit Assessment.
Sources
- NIJ, Personal Armor Fit Assessment (excerpted from ASTM E3003, PDF) (read 2026-10-01)
- BJA, BVP Frequently Asked Questions (PDF, updated September 2025), question 19 (read 2026-10-01)
- U.S. Army, Weapon Systems Handbook 2012, Soldier Protection (copy hosted by the Federation of American Scientists) (read 2026-09-30)
- NIJ, Selection and Application Guide to Ballistic-Resistant Body Armor for Law Enforcement, Corrections and Public Safety (NCJ 247281) (read 2026-09-30)
- NIJ, Ballistic Resistance of Body Armor, NIJ Standard-0101.06 (PDF) (read 2026-09-29)
- NIJ, Ballistic Resistance of Body Armor, NIJ Standard 0101.07 (read 2026-09-29)
- NIJ, Specification for NIJ Ballistic Protection Levels and Associated Test Threats, NIJ Standard 0123.00 (read 2026-09-29)
- NIJ, Compliant Products List: Ballistic Resistant Body Armor (read 2026-09-29)
- NIJ, Body Armor Selection, Care, and Maintenance (NCJ 251599) (read 2026-10-01)
- CJTTEC, Body Armor Care and Replacement (read 2026-10-01)