ANSI/ISEA 107 is the American national standard that sets the design, material, and testing requirements for high-visibility safety apparel worn on the job. It sorts vests, jackets, pants, and accessories into three garment types based on the work environment and into performance classes based on how much fluorescent and retroreflective material the garment carries. The standard is voluntary on its face, but federal highway regulations and OSHA enforcement turn its Class 2 and Class 3 requirements into legal obligations for most workers exposed to traffic or moving equipment.
Garment Types by Work Environment
The 2020 edition of the standard uses three types, and picking the right one is the first decision because it drives every requirement that follows.1Centers for Disease Control and Prevention. ANSI/ISEA 107-2020
Type O (Off-Road) is for workers who are not exposed to public-road traffic or temporary traffic control zones. Warehouses, rail yards, refineries, and mines are typical settings. The concern is conspicuity around machinery moving at relatively low speeds.
Type R (Roadway) covers workers on or alongside public roads and inside temporary traffic control zones. Construction crews, highway maintenance teams, utility workers, and survey personnel fall here.
Type P (Public Safety) is built for law enforcement, firefighters, and EMS. These garments have to work around duty belts and body armor, so Type P has its own material-area minimums that differ from Type R even within the same class.
Performance Classes and Material Minimums
Within each type, performance classes rank garments by the square inches of fluorescent background fabric and retroreflective (or combined-performance) material they must carry. Higher class means more visible surface area and applies to more dangerous conditions.
Class 1
Class 1 is the lowest level and only applies to Type O situations where vehicle or equipment speeds stay below roughly 25 mph and workers can keep distance from moving hazards. It requires at least 217 square inches of background material and 155 square inches of retroreflective or combined-performance material. A simple vest worn by a parking attendant or warehouse worker is typical. Class 1 does not satisfy federal highway or most OSHA requirements.
Class 2
Class 2 is the minimum acceptable level for both Type R and Type P. A Type R Class 2 garment needs at least 775 square inches of background fabric and 201 square inches of retroreflective material. A Type P Class 2 garment needs at least 450 square inches of background fabric and 201 square inches of retroreflective material. The smaller background allowance for Type P reflects the reality that body armor and duty gear limit where fluorescent fabric can be placed.
Class 3
Class 3 is the highest single-garment level and is required when workers face fast-moving traffic, complex work zones, or tasks that pull attention away from approaching vehicles. A Type R Class 3 garment must carry at least 1,240 square inches of background fabric and 310 square inches of retroreflective material. A Type P Class 3 garment requires at least 775 square inches of background fabric and 310 square inches of retroreflective material. Class 3 garments almost always include sleeves with reflective bands so arm movement reads as a human shape rather than a sign or barrel.
Class E Supplemental Items
Pants, bib overalls, shorts, and gaiters fall under Class E. They cannot satisfy high-visibility requirements on their own. Paired with a Class 2 or Class 3 upper garment, however, they bring the full ensemble up to Class 3 coverage. Class E items must provide at least 465 square inches of background fabric and 109 square inches of retroreflective material.
Colors, Reflective Material, and Placement
The standard allows three background colors: fluorescent yellow-green, fluorescent orange-red, and fluorescent red. These are chosen for contrast against most natural and built environments, and fabrics are tested for color accuracy and brightness both when new and after laundering and UV exposure.1Centers for Disease Control and Prevention. ANSI/ISEA 107-2020 Retroreflective strips return light toward its source, which is what makes a headlight beam light up the wearer at night. Combined-performance materials do both jobs in a single strip, which helps manufacturers meet minimums on smaller garments.
The standard requires 360-degree visibility. Reflective bands typically run horizontally around the torso and vertically over each shoulder, outlining the human form so a driver can tell a person from a stationary object.
Minimum band widths depend on type and class. Class 1 garments require reflective strips at least one inch wide. Type R Class 2 requires 1.38 inches, and Type P Class 2 requires two inches. All Class 3 garments require the full two-inch width. Small horizontal gaps in the banding are allowed for zippers, seams, and fasteners, but no gap can exceed 50 millimeters (about two inches). On Class 3 garments with sleeves, the upper arm band must sit between elbow and shoulder, and reflective trim must be at least two inches from the sleeve cuff and from the garment hem. The same two-inch clearance applies to the bottom of Class E pant legs.
Labeling
Every compliant garment carries a permanent label that lets a safety manager or inspector verify compliance without measuring anything. Required elements are the manufacturer’s name or trademark; the type and class (for example, Type R, Class 2); the edition of the standard (currently 107-2020); a performance pictogram showing the class and the retroreflective material’s performance level; and care instructions with a number that indicates the maximum number of wash cycles before the materials degrade below acceptable levels.
That wash-cycle number matters more than most buyers realize. Once a garment exceeds its rated laundering limit, the manufacturer no longer guarantees the fluorescent color or the reflective strips will perform. A vest that still looks fine can have retroreflective material that has degraded enough to cut nighttime visibility sharply.
When Compliance Is Legally Required
On federal-aid highways, the standard stops being voluntary. Under 23 CFR Part 634, every worker within the right-of-way of a federal-aid highway who is exposed to traffic or construction equipment must wear high-visibility safety apparel meeting ANSI/ISEA 107 Performance Class 2 or 3.2GovInfo. 23 CFR Part 634 – Worker Visibility The rule reaches construction crews, maintenance teams, survey crews, utility workers, incident responders, and law enforcement working near highway traffic.3Federal Register. Worker Visibility Class 1 garments never satisfy this regulation, whatever the task.
OSHA reaches the same result by a different route. There is no single OSHA rule that says “wear ANSI/ISEA 107 gear.” For construction flaggers, 29 CFR 1926.201(a) requires warning garments conforming to Part 6 of the MUTCD.4Occupational Safety and Health Administration. 1926.201 – Signaling For workers near excavations exposed to vehicle traffic, 29 CFR 1926.651(d) requires high-visibility vests. Everyone else in a highway work zone falls under the General Duty Clause, Section 5(a)(1) of the OSH Act. OSHA has explained that being struck by traffic is a well-recognized hazard in construction, that high-visibility apparel is a feasible way to reduce it, and that FHWA’s Worker Visibility Rule shows the industry recognizes both the hazard and the fix.5Occupational Safety and Health Administration. Standard Interpretation – High-Visibility Apparel
Penalties are not small. As of figures effective January 15, 2025, a serious violation carries a maximum penalty of $16,550 per occurrence. Willful or repeated violations can reach $165,514 each. Failure to correct a cited violation after the abatement deadline adds $16,550 per day. These amounts adjust annually for inflation.6Occupational Safety and Health Administration. OSHA Penalties
Flame-Resistant High-Visibility Garments
Workers in oil and gas, electrical utilities, and welding operations often need both visibility and flame resistance. ANSI/ISEA 107 lets manufacturers label a garment with “FR” followed by the applicable ASTM or NFPA fire-resistance standard. Common companions are NFPA 2112 (flash fire) and ASTM F1506 (electric arc). A garment meeting NFPA 1971, 1977, or 2112 can carry its own NFPA certification label alongside the ANSI 107 label. NFPA 701, which covers textiles like curtains and tents, cannot be used to claim flame resistance for an ANSI 107 garment. If your worksite requires both, check the label for dual compliance rather than layering a standard synthetic vest over FR clothing, which can create melt hazards.
Service Life and Replacement
No fixed expiration date applies to every garment because wear depends on the environment, frequency of use, and laundering. A rough industry rule of thumb is about six months for daily-wear garments and up to three years for gear worn only occasionally. Beyond those windows, inspect carefully and lean toward replacement.
Retire any high-visibility garment that shows faded fluorescent color with poor contrast against its surroundings; retroreflective strips that have peeled, cracked, or lost their glow; heavy soiling that will not launder out; or tears and abrasion that reduce visible material below the class minimums. Once a garment falls below its class minimums, it no longer meets the standard, and on a federal-aid highway or under an OSHA General Duty citation, it no longer meets the law.