Safety Shoe Ratings Decoded: SB, S1, S3, S5 Made Simple
You've seen the labels — SB, S1, S3, S5 — stamped on safety shoes or listed in tender specifications. But what does each rating actually guarantee? This guide strips away the jargon and tells you exactly what protection each level provides, which industries need which rating, and how India's own IS 15298 and IS 17043 standards map to this international system.
Where Do These Ratings Come From?
The SB through S5 classification system originates from EN ISO 20345, the European standard for safety footwear. It defines the minimum performance requirements for safety shoes and organises them into progressive levels. Each level builds on the one below it, adding more protection features. While India uses its own BIS standards (IS 15298 and IS 17043), the SB–S5 system is universally referenced in global procurement, multinational safety policies, and export documentation.
The system splits into two tracks: S1–S3 for leather/textile upper shoes (where the upper is not inherently waterproof) and S4–S5 for polymer/rubber shoes (where the entire shoe is moulded from waterproof material like PVC). Understanding this split is crucial — it determines which product category you should be evaluating.
The Complete Rating Breakdown
Each rating adds specific features to the one below it. Here is every level laid out clearly:
| Rating | Protection Features | Upper Type |
|---|---|---|
| SB | 200J toe cap impact + 15kN compression only | Leather / textile |
| S1 | SB + closed heel + antistatic + energy absorption in heel | Leather / textile |
| S2 | S1 + water penetration and absorption resistance in upper | Leather / textile |
| S3 | S2 + penetration-resistant midsole + cleated outsole | Leather / textile |
| S4 | 200J toe cap + antistatic + energy absorption + fully waterproof | Polymer / rubber (moulded) |
| S5 | S4 + penetration-resistant midsole + cleated outsole | Polymer / rubber (moulded) |
Key observation: S4 and S5 are not "higher" than S3 — they are the parallel trackfor polymer/rubber footwear. S4 is to S1 what S5 is to S3, but in a fully waterproof, moulded construction. A PVC safety shoe cannot be rated S3 (that's for leather uppers). It would be rated S5 if it has all the equivalent protection features.
Each Rating Explained in Detail
SB — Safety Basic
The bare minimum. SB shoes have a protective toe cap tested to 200J impact and 15kN compression — and nothing else. No requirement for a closed heel (slip-on designs are permitted), no antistatic properties, no energy absorption, no water resistance. SB is rarely specified in Indian industry because it offers inadequate protection for almost any industrial environment. You might see it in very low-risk settings like light assembly or retail stockrooms.
S1 — The Industry Baseline
S1 is where real industrial safety begins. Beyond the toe cap, it requires: a closed heel region (no open-back designs), antistatic properties (dissipates static charge to prevent sparks around flammable materials), and energy absorption in the heel (minimum 20J, reducing fatigue and impact through the heel during walking). Most indoor manufacturing, warehousing, and general engineering environments specify S1 as the minimum. The Komisafe Knight and Komisafe Aviator — both certified under IS 15298 Part 2 — deliver antistatic and energy absorption properties that correspond to S1 requirements.
S2 — Water Resistance Added
S2 takes S1 and adds water penetration and absorption resistance in the upper material. After 60 minutes of dynamic water exposure testing, the upper must not allow significant water ingress. This is relevant for outdoor workers exposed to rain, damp conditions, or occasional puddles — but not standing water. S2 is less commonly specified than S1 or S3 because most buyers either need dry indoor shoes (S1) or full outdoor protection (S3).
S3 — The Construction & Heavy Industry Standard
S3 is the most widely specified rating for construction, infrastructure, and heavy industry. It includes everything in S2 plus a penetration-resistant midsole (steel or composite plate that stops nails and sharp objects from piercing through the sole) and a cleated outsole (deep lugs for traction on loose, muddy, or uneven ground). When a government tender says "S3 safety shoes," this is the full-protection leather/PU shoe with toe, sole, and water protection. The Komisafe Rocky (₹1,799), with its rugged outsole and IS 15298 Part 2 certification, provides protection aligned with S3 requirements.
S4 — Fully Waterproof Polymer
S4 is the polymer/rubber equivalent of S1. The entire shoe is moulded from a waterproof material (PVC, rubber, or polyurethane polymer), making it inherently impervious to water — no upper seams to leak, no stitching to degrade. S4 shoes provide the toe cap, antistatic properties, and energy absorption of S1 in a fully sealed construction. They're used in food processing, chemical handling, and any environment where the foot must stay completely dry.
S5 — Maximum PVC/Rubber Protection
S5 adds a penetration-resistant midsole and cleated outsole to S4 — the polymer equivalent of S3. This is the highest rating for moulded footwear. PVC safety shoes like the Komico Eco and Komico Xpert — certified under IS 17043 Part 2: 2024 — deliver S5-equivalent protection: steel toe, oil-acid resistant outsole, and fully waterproof moulded construction, all starting from ₹799.
Which Rating for Which Industry?
Choosing the right rating depends on your specific workplace hazards. Here is a practical guide:
Indoor Manufacturing & Assembly
Dry floors, moderate risk of dropped objects. Antistatic properties needed around electronics or flammable materials. Komisafe Aviator or Knight recommended.
Warehousing & Logistics
Clean, dry concrete floors. Toe protection for falling packages. Energy absorption for long walking distances. Komisafe Aviator's lightweight PU sole is ideal.
Construction & Infrastructure
Nail hazards, wet terrain, rough ground. S3 for leather/PU shoes, S5 for PVC. Komico range at ₹799–999 makes S5-level protection affordable at scale.
Chemical & Pharmaceutical
Chemical spills, acid/alkali exposure, wet floors. Fully waterproof moulded construction mandatory. Komico PVC shoes provide seamless chemical resistance.
Oil & Gas, Mining
Heavy machinery, rough terrain, anti-static essential around hydrocarbons. Komisafe Rocky offers rugged S3-equivalent protection under IS 15298 Part 2.
Food Processing & Agriculture
Hygiene requirements demand washable, non-porous footwear. PVC construction allows easy sanitation. S5 adds puncture protection for agricultural environments.
How Indian IS Standards Map to SB–S5
India does not use the SB–S5 designation system directly. Instead, BIS issues its own standards with equivalent testing requirements. Here is how they correspond:
| Indian Standard | Covers | Comparable Rating | JMDi Safezone Range |
|---|---|---|---|
| IS 15298 Part 2 | Direct moulded PU/rubber shoes | S1 to S3 (depending on features) | Komisafe Aviator, Knight, Rocky |
| IS 15298 Part 3 | Cemented sole leather shoes | S1 to S3 (depending on features) | — |
| IS 17043 Part 2: 2024 | PVC injection-moulded shoes | S4 / S5 | Komico Eco, Xpert, Rock, Star, Tejas, Blaze |
The core testing is aligned: 200J impact, 15kN compression, penetration resistance, outsole abrasion, and oil resistance appear in both the Indian and European standards. The practical difference is labelling — an Indian ISI certified shoe won't display an SB/S1/S3 marking, but the underlying protection levels are equivalent. For a deeper comparison of the two Indian standards, read our IS 15298 Part 2 & Part 3 explainer.
Common Mistakes When Specifying Ratings
Procurement officers and safety managers frequently make these errors when writing tender specifications or purchasing safety footwear:
Specifying S3 when S5 is needed
If the workplace involves standing water, chemical exposure, or needs fully waterproof footwear, you need the S4/S5 track (PVC/rubber). S3 leather shoes resist water penetration, but they are not waterproof. For wet environments, PVC shoes like Komico are the correct choice.
Over-specifying for the environment
A clean, dry warehouse does not need S3. S1 provides toe protection, antistatic, and energy absorption — everything a warehouse worker needs. Over-specifying increases cost per pair and reduces comfort (S3 shoes are heavier due to the midsole plate). Match the rating to the actual hazards, not the perceived prestige.
Assuming higher number = better
S5 is not "better" than S3. They are different tracks for different materials. S3 is the highest for leather/PU shoes. S5 is the highest for polymer/rubber shoes. A Komisafe Rocky (IS 15298 Part 2, S3-equivalent) and a Komico Eco (IS 17043, S5-equivalent) both provide full protection — just for different workplace conditions.
Related Reading
IS 15298:2024 Part 2 & Part 3 Explained for Safety Shoes
Deep dive into India's PU/rubber safety shoe standard — testing requirements, compliance, and certification.
ISI Certification for Safety Shoes Explained: IS 15298 vs IS 17043
What the standards cover, how to verify the ISI mark, and why it matters for procurement.
PVC vs PU Safety Shoes: Which One for Which Workplace?
Complete comparison of sole types, industries, comfort, durability, and cost per pair.
Komico vs Other Safety Shoes: What Sets JMDi Safezone Apart
How Komico compares to other safety shoe brands on certification, quality, and value.
Not Sure Which Rating You Need?
Tell us your industry and workplace conditions. We'll recommend the right Komico or Komisafe model with the correct protection level — no over-specification, no under-protection.
Frequently Asked Questions
What does SB mean on safety shoes?
SB stands for Safety Basic — the minimum rating under EN ISO 20345. It requires only a 200J impact and 15kN compression rated toe cap. No antistatic, no heel energy absorption, no water resistance. Rarely adequate for industrial environments.
What is the difference between S1 and S3 safety shoes?
S1 provides toe protection, antistatic properties, energy absorption, and a closed heel. S3 adds everything in S2 (water resistance) plus a penetration-resistant midsole and cleated outsole. S3 is the standard for construction and heavy industry.
Which safety shoe rating do I need for construction?
Construction sites typically require S3 (leather/PU) or S5 (PVC/rubber). For wet sites, Komico PVC shoes offer S5-equivalent protection from ₹799. For drier sites, Komisafe PU shoes provide S3-equivalent protection.
What is an S5 safety shoe?
S5 is the highest rating for polymer/rubber footwear — fully waterproof with a penetration-resistant midsole and cleated outsole. Komico PVC safety shoes certified under IS 17043 Part 2: 2024 provide S5-equivalent protection.
How do Indian safety shoe standards compare to EN ISO 20345?
IS 15298 (PU/rubber shoes) maps to S1–S3. IS 17043 (PVC shoes) maps to S4/S5. Core tests — 200J impact, 15kN compression, penetration resistance — are equivalent. The difference is in labelling, not protection.