Work and Safety Footwear Buying Guide: S1P to S5, Winter Boots and Fit

Work footwear is the piece of PPE you notice with every step of the shift. In Estonia, safety shoes and boots for site work are chosen by the same European standard as anywhere in the EU – EN ISO 20345 – but the Estonian winter, with frost, slush and thaw, adds its own demands. This buying guide explains the safety classes, what the toe cap and midsole do, which winter markings matter, when to choose shoes or boots and how to get the size right.

Safety classes S1P, S3, S3S and S5 explained

Every safety shoe under EN ISO 20345 has a toe cap tested to 200 joules of impact and 15 kN of compression – the basic "SB" level. The classes add protection on top of it:

• S1 – closed heel area, antistatic properties (A) and energy absorption in the heel (E).
• S1P – S1 plus a puncture-resistant midsole. The upper is not tested for water, so it suits dry indoor work.
• S3 – a water-resistant upper, a puncture-resistant midsole and a cleated outsole. The practical minimum on an outdoor construction site.
• S3L and S3S – S3 with a non-metal midsole; S3S has passed the stricter test with a thinner 3 mm nail.
• S5 – the class used for PU or rubber safety wellingtons for very wet work. An insulated S5 wellington with CI is an alternative to a leather boot in wet winter conditions.
• S7 and S7S – S3 plus water resistance of the whole boot (WR), including the seams.

Since the 2022 revision, a basic slip test on ceramic tile is part of every safety shoe; the extra mark SR means the sole has also passed the harder test with glycerine. Boots certified to the older 2011 version show SRA, SRB or SRC – SRC was the highest of these. For a deeper comparison read S1P vs S3 vs S3S.

Toe cap and midsole: steel or metal-free?

The standard does not care what the toe cap is made of: steel, aluminium and composite caps all have to pass the same 200 J test. A composite cap is lighter and does not conduct cold, but it needs thicker walls, so the toe can feel bulkier. A steel cap is slimmer and very robust, but heavier and colder in winter.

The midsole protects against nails from below. A steel plate (P) depends less on the shape of the sharp object, but it is stiffer and conducts cold. A textile insert (PL or PS) is lighter, more flexible and insulates better. Of the two non-metal types, PS protects better against thin nails, so choose S3S for demolition, renovation and formwork. Details in composite vs steel toe caps.

Winter markings: CI, HI, WR and SR

The letters after the class are extra properties the manufacturer has had tested. If a letter is missing, the property has not been tested – even if the product is sold as a winter boot. For winter work these matter most:

• CI – cold-insulated sole. The boot is kept at −17 °C for 30 minutes and the temperature on the insole may drop by no more than 10 °C. It is a pass/fail test, not a temperature rating: "warm to −30 °C" is the manufacturer's own claim.
• HI – heat-insulated sole for asphalt and roofing work; it does nothing for cold. HRO means the outsole has been tested against contact with a 300 °C surface.
• WR – the whole boot, including seams and the joint between upper and sole, is tested for water resistance (S7 = S3 + WR).
• SR – slip-tested on ceramic tiles with glycerine. No EN ISO 20345 marking promises grip on ice.

More in winter safety boot markings explained.

Safety shoes or safety boots?

Low safety shoes are lighter and better for a lot of walking on flat ground – installation work, warehouses and interior finishing. High boots support the ankle on uneven ground, scaffolding and excavations, and keep snow out in winter. Many workers keep both: light S3S shoes for summer and an insulated S3 CI boot for winter.

ESD is a separate need. On a normal construction site antistatic (A) footwear is enough, but electronics areas, data centres and technical rooms may require ESD footwear. See the ESD safety shoes collection, and for outdoor work check that the model also carries CI.

Winter boots for the Estonian winter

In winter, frost alternates with slush and thaw periods, and most heat is lost downwards into frozen ground, concrete slabs and rebar. For outdoor work:

• Dry frost: a high-cut S3 or S3S boot with CI and SR (or SRC) and a fur or wool lining.
• Slush, meltwater, wet excavations: S7 or S7S with CI – the whole boot is tested for water, not just the upper.
• Metal-free construction (composite toe cap plus textile midsole) avoids a cold bridge into the boot.
• Ice: a winter rubber compound that stays soft in frost, deep open lugs and, where site rules allow, anti-slip cleats outdoors.
• Closures such as BOA, FITGO or quick-lace systems are easier to operate with gloves on than ordinary laces.

A step-by-step checklist is in how to choose winter safety boots.

Fit: the toe cap does not stretch

• Measure your feet in the afternoon, standing with your full weight, wearing the socks you work in.
• Compare the measurement with the size chart on the product page, not with your old boots – one EU size is only about 6.7 mm, and brands differ.
• For winter boots worn with thick wool socks, add 1–1.5 cm to your bare foot length. Between sizes? Take the larger one.
• Toes must never touch the toe cap, and a heel that lifts on every step causes blisters.
• Use only insoles approved for that model – this matters especially in antistatic and ESD boots.

Read the safety boot fit guide and our size guide.

Quick table: which safety footwear for which job

Checklist before you order

• Check the site safety plan (tööohutuse plaan) – it sets the minimum.
• Choose the class: S3 or higher for outdoor sites, S1P only for dry indoor work.
• For winter: CI on the label, and WR (S7) if you stand in slush.
• Decide between metal-free and steel based on comfort, cold and metal detectors.
• Measure both feet with work socks on and size for the longer foot.
• Ordering for a crew: collect foot length per worker instead of guessing.

Where to order work and safety footwear

Browse all models in the safety boots collection – every product page lists the class and the extra markings. For the PPE rules on site, see PPE on Estonian construction sites. Equipping a crew? The ready workwear kits combine a jacket, trousers and safety footwear per worker. TrustGear is an online shop run by an Estonian company, and we deliver across Estonia – Tallinn, Tartu, Pärnu and elsewhere – in 8–16 days.

FAQ

Is S1P enough on a construction site?

Usually not outdoors. S1P has no water-tested upper, so S3 is the practical minimum on an outdoor site. The site safety plan always comes first.

Does CI mean the boot is warm at −30 °C?

No. CI is a pass/fail test of the sole at −17 °C. Real warmth also depends on the lining, socks, fit and how much you move.