Steel Blue Southern Cross Zip Composite S3 Safety Boot – Black Amber
£127.95
£127.95
Details
Overview
The Steel Blue Southern Cross Zip Composite in Black Amber is an S3-rated, metal-free safety boot — one of Steel Blue’s most trusted styles, now in a striking new Black Amber colourway with a lightweight composite toe cap in place of steel. It’s built for tradespeople who need genuine all-day protection without the weight of a steel toe, and the composite cap passes the same 200-joule impact standard as its steel equivalent while being completely non-metallic.
At 150mm ankle height with a scalloped, padded collar, it moves with you rather than fighting you across a long shift. The industrial-grade side zip gets you in and out in seconds, while the lace closure lets you dial in the fit precisely. Premium water-resistant nubuck leather keeps the elements out, and an abrasion-resistant scuff cap protects the toe from the daily knock-about that kills cheaper boots early.
Underneath is Steel Blue’s Trisole® Comfort Technology — the Ortho Rebound® polyurethane footbed and strategically placed Poron® pads cushion your feet, knees, hips and lower back against shift-long fatigue. A Baltico moisture-wicking lining keeps things dry from the inside, and the TPU outsole is heat resistant to 130°C, oil resistant and SRC slip-rated on both wet ceramic and steel.
Prefer a steel toe or a different colour? See the full Steel Blue Southern Cross range.
Key features & specifications
- Safety rating: S3 — certified to EN ISO 20345 (penetration resistance, antistatic, water-resistant upper, energy-absorbing heel)
- Toe protection: 200J composite toe cap — metal-free, airport-friendly, same protection as steel
- Slip rating: SRC (highest standard slip rating — tested on wet ceramic and steel)
- Comfort: Trisole® Comfort Technology with Ortho Rebound® footbed and Poron® cushioning
- Closure: Industrial-grade side zip with lace closure for a secure, precise fit
- Upper: Premium water-resistant nubuck leather
- Scuff cap: Abrasion-resistant, for extended toe protection
- Lining: Baltico moisture-wicking hydrophobic lining
- Outsole: TPU — SRC slip-rated, oil resistant, heat resistant to 130°C
- Height: 150mm ankle with scalloped padded collar
- Colour: Black Amber — new for 2026
- Sizes: UK 7–14 (including half sizes through the mid-range)
- Style code: 398590-BBG
Download the full Steel Blue Southern Cross technical spec sheet (PDF).
Who it’s for
The composite Southern Cross suits anyone who wants full S3 protection without metal — construction, utilities, heavy industry, and anyone who’d rather not set off a metal detector at airports or secure sites. Because the toe is non-metallic it’s also a little warmer in cold conditions than steel. If you specifically want a steel toe, the standard Southern Cross range covers that.
Sizing & fit
The Southern Cross fits true to size — order your normal size. Available in UK 7–14 with half sizes through the mid-range. If you’re between sizes, size up. If the fit isn’t right, we offer free exchanges, and every pair comes with Steel Blue’s 30-day comfort guarantee.
Why buy from BIG Boots UK?
Ryan has worn Steel Blue and Australian work boots his whole working life, and has been selling them here in the UK since 2020 — making BIG Boots UK one of the very first online retailers of Steel Blue boots in the country. We’re an authorised Steel Blue distributor, so every pair is genuine, fully warranted, and backed by people who actually wear them on the job.
FAQs
Is the composite toe as strong as a steel toe?
Yes. The composite toe cap meets the same 200-joule impact and 15kN compression standard as a steel toe under EN ISO 20345 — the protection is equivalent. The difference is that it’s lighter, completely metal-free, and doesn’t conduct heat or cold the way steel does.
What does the S3 rating mean?
S3 is one of the highest common safety ratings. On top of the 200J toe cap it adds penetration resistance (protection underfoot from nails and sharps), a water-resistant upper, antistatic protection and an energy-absorbing heel. This boot is also SRC slip-rated, the highest standard slip rating.
Is this boot airport- and metal-detector-friendly?
Yes. The toe cap and construction are non-metallic, so it won’t trigger metal detectors — a genuine advantage for airport ground crew, secure sites and anyone who passes through screening regularly.
Why is the sole rated to 130°C and not higher?
This model uses a TPU outsole, which is rated for contact heat up to 130°C — ideal for general site and industrial use. If you need a higher heat rating, some other Steel Blue models use a nitrile sole rated to 300°C; just ask and we’ll point you to the right one.
How long have you been selling Steel Blue boots?
Ryan has worn Steel Blue and Australian work boots his whole working life, and has been selling them here in the UK since 2020 — making BIG Boots UK one of the very first online retailers of Steel Blue boots in the country. We’re an authorised Steel Blue distributor and only recommend boots we’d wear ourselves.
Do you offer next day delivery?
Yes. Steel Blue boots come with free Royal Mail Tracked 24 express delivery, usually arriving the next business day when ordered before 2pm. For a guaranteed next-day slot, DPD Next Day is available at checkout for £8. Every pair is backed by a 30-day comfort guarantee and a 6-month manufacturer’s warranty.
Sizing Recommendations
Shipping Details
Standard delivery: Royal Mail Tracked 48, usually 2–3 business days. Free on orders over £60, otherwise £3.00.
Free express delivery on orders over £110: Royal Mail Tracked 24, usually the next business day when ordered before 2pm.
Guaranteed next day: DPD, £8, order before 2pm Monday–Friday. Saturday delivery: DPD, £10, order before 2pm Friday.
Northern Ireland: Tracked 48 £3.50 (free over £60), Tracked 24 £8 (free over £110). Isle of Man and Jersey: £9.99.
Every order is tracked with text and email updates. Questions? Email ryan@bigboots.co.uk.
Australia’s leading manufacturer of work and safety boots, since 1995
Our story began in Australia, and we’ve since grown to become Australia’s leading manufacturer of work and safety boots with subsidiaries in Europe, the USA and New Zealand. Since 1995, we’ve been putting the same amount of care, dedication and craft into our work as the tradespeople who wear our boots.
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FAQs
Do you offer next day delivery?
Yes. Orders over £110 get free Royal Mail Tracked 24 express delivery, usually next day if ordered before 2pm. For a guaranteed next-day slot on any order, choose DPD Next Day (£8) at checkout.
How do I return or exchange my items?
We recommend for any exchanges, you purchase the size you're after and then return your current pair for a refund. This saves time waiting for your new item to arrive.
We know buying footwear and workwear online can be difficult, so we try to make returns as easy as possible. You arrange the return postage back to us, which is how we keep our express delivery free.
Please click here to start the process.
Do you ship to Europe and Ireland?
Unfortunately not, we do ship to Northern Ireland however due to brexit and the complications with shipping and then duties costs, we find it better for customers to try and find a local supplier as it will save you money on duties.
Northern Ireland customers do not have to pay duties as you’re part of the United Kingdom and postage is the same as the mainland.
My boots are faulty within the 6 month warranty period, what do I need to do to submit a claim?
Please click on the link below and follow the instructions. If your boots are just outside 6 months, please contact us directly to discuss options - ryan@bigboots.co.uk or 0330 043 0873
https://www.bigboots.co.uk/pages/steel-blue-warranty-details
Do you have a physical store?
Unfortunately we don't at the moment. We're in the process of looking for a new showroom and once that becomes available, we'll let you know.