FR vs. Hi-Vis vs. Arc-Rated: Which Safety Uniforms Does Your Workforce Need?

FR, hi-vis, and arc-rated clothing serve different purposes and meet
different safety standards. Choosing the wrong category can leave
workers unprotected or waste budget on gear they do not need. This guide
breaks down what each type does, when it is required, and how to match
the right protection to each role.

If you manage safety uniforms for a workforce that includes
electrical, utility, manufacturing, or outdoor crews, the distinctions
between these categories matter. Getting them wrong is not just a
compliance issue. It is a safety risk.

Definitions: FR,
Hi-Vis, and Arc-Rated Explained

These three terms get used interchangeably, but they are not the same
thing.

FR (Flame-Resistant). FR uniforms are made from
fabrics that self-extinguish when the ignition source is removed. They
do not melt or drip onto skin, which is what causes the worst burn
injuries. FR clothing is tested and certified under NFPA 2112, the
standard for flash fire protective garments.

Hi-Vis (High-Visibility). Hi-vis uniforms make the
wearer visible in low-light conditions or around moving vehicles and
equipment. They use fluorescent background materials and retroreflective
striping. Hi-vis garments are classified under ANSI/ISEA 107, with Class
2 and Class 3 being the most common for workplace use. Class 3 provides
the highest level of visibility.

Arc-Rated. Arc-rated clothing protects against arc
flash, the explosive release of energy from an electrical fault. These
garments are tested and assigned a cal/cm2 (calories per square
centimeter) rating that indicates how much arc energy they can withstand
before the wearer would receive a second-degree burn. Arc-rated clothing
is specified under NFPA 70E.

Here is the critical distinction: all arc-rated clothing is
flame-resistant, but not all FR clothing is arc-rated. A garment
certified under NFPA 2112 for flash fire protection does not
automatically protect against arc flash unless it also carries a cal/cm2
rating tested per ASTM F1959.

When Each Category Is
Required

Each category of safety uniform addresses a specific hazard. The
requirement depends on the work environment and the risks present.

FR uniforms are required for: Oil and gas workers
exposed to flash fire hazards. Welders and workers near open flames.
Chemical plant operators working with flammable materials. Any role
where OSHA’s general duty clause or industry-specific regulations
mandate flash fire protection.

Hi-vis uniforms are required for: Roadway and
construction workers (MUTCD and OSHA requirements). Utility crews
working near traffic or heavy equipment. Warehouse workers in areas with
forklift traffic. Airport ground crews and any role where visibility is
a documented safety concern.

Arc-rated clothing is required for: Electricians and
electrical workers performing tasks on or near energized equipment.
Utility line workers. Anyone working within the arc flash boundary as
defined by an arc flash hazard analysis per NFPA 70E.

The key takeaway: the hazard determines the category. A hazard
assessment for each role is the starting point.

Dual-Rated Garments

Some roles face more than one hazard simultaneously. Utility line
crews are a common example. They need arc flash protection for
electrical work and high visibility for roadside exposure.

Dual-rated garments combine FR or arc-rated protection with hi-vis
materials in a single piece of clothing. These garments carry both an
NFPA 70E arc rating and an ANSI/ISEA 107 visibility classification.

Dual-rated options reduce the number of garments workers need to
carry and wear. Instead of layering a hi-vis vest over an arc-rated
shirt, the worker wears one garment that meets both standards.

When specifying dual-rated garments, verify that both ratings are
current and that the garment meets the minimum requirements for each
standard independently. A hi-vis garment with a low arc rating may not
provide adequate electrical protection.

How to Determine What
Your Roles Need

Matching safety uniform requirements to specific roles takes a
systematic approach.

Step 1: Conduct a hazard assessment. OSHA requires
employers to assess workplace hazards. For uniform purposes, this means
identifying which roles face flash fire exposure, arc flash exposure,
visibility risks, or some combination. Document everything.

Step 2: Map roles to protection categories. Based on
the hazard assessment, assign each role to the appropriate uniform
category. Some roles may need FR only. Others may need arc-rated with a
specific cal/cm2 minimum. Others may just need hi-vis.

Step 3: Specify the standards and ratings. General
categories are not enough. Specify the exact standard (NFPA 2112, NFPA
70E, ANSI/ISEA 107 Class 2 or 3) and any minimum ratings (cal/cm2 for
arc-rated). This prevents substitution of garments that look similar but
do not meet the requirement.

Step 4: Document and communicate. Create a
role-to-garment matrix that maps every job title to its required uniform
configuration. Share it with managers, safety officers, and whoever
handles uniform ordering.

This documentation is also critical for OSHA inspections. If an
inspector asks why a worker is wearing a specific garment, the hazard
assessment and role mapping provide the answer.

How a
Managed Program Enforces the Right Gear Per Role

Knowing what each role needs is one thing. Making sure every employee
actually receives the correct items is another.

In a self-managed program, the burden falls on supervisors and
purchasing staff to remember which roles get which garments. Mistakes
happen. An electrician gets a standard FR shirt instead of an arc-rated
one. A new hire in public works gets a Class 2 vest when the job
requires Class 3.

A managed uniform program eliminates this risk. The Proximity System ties each
employee’s profile to their role, and each role to its required garment
specifications. When an employee places an order, the system only shows
items that meet their role’s safety requirements.

This means a utility line worker cannot accidentally order a
non-rated garment. A warehouse associate cannot order arc-rated clothing
they do not need. The system enforces the right gear per role, every
time, without relying on individual knowledge.

For manufacturing
environments and other industries with diverse safety requirements
across roles, this kind of automated enforcement is the most reliable
way to stay compliant.

Schedule a Demo

If your workforce includes roles that require FR uniforms, hi-vis
gear, arc-rated clothing, or any combination, a managed program can
simplify compliance and reduce risk.

Contact Unitec to schedule a demo of The Proximity System and see how
role-based uniform management works for safety-critical workforces.