Timberland PRO Siberian CSA 8" Composite Toe Waterproof 600G Insulated Work Boot — Brown — TB0A63PUEM4
When temperatures drop, the Siberian is built to keep you working — 600 grams of insulation, certified for cold as low as -40°C / -40°F.
A premium full-grain waterproof leather upper and waterproof membrane keep moisture out, a breathable flannel lining keeps feet comfortable through long shifts in snow and wet conditions, and an OrthoLite® O-Therm™ aerogel-infused footbed blocks cold from the ground up. It carries a composite safety toe, a non-metallic puncture-resistant plate, a non-metallic shank, and CSA certification.
Key Features of the Timberland PRO TB0A63PUEM4
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Asymmetrical Composite Safety Toe — Lightweight, non-metallic protection meeting ASTM F2413 impact and compression standards.
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CSA-Certified Protection — Designed to meet Canadian jobsite safety standards.
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Non-Metallic Puncture-Resistant Plate — Underfoot protection from nails and sharp debris.
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600 Grams of Insulation — Certified to -40°C / -40°F for extreme-cold work.
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Premium Full-Grain Waterproof Leather with Waterproof Membrane — Keeps snow and moisture out.
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OrthoLite® O-Therm™ Aerogel Footbed — An aerogel-infused thermal barrier that blocks cold transfer from the ground.
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Breathable Flannel Lining — Moisture-wicking warmth against the foot.
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Non-Metallic Shank — Structural support with no metal to conduct cold.
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8" Height — Coverage against snow and slush. Imported.
Built for Extreme Cold
600 grams of insulation behind a sealed waterproof membrane handles the air; the O-Therm™ aerogel footbed handles the ground, which is where most winter boots lose heat. Together they carry the Siberian's -40° rating — built for standing work outdoors in genuine winter, not just walking through it.
Nothing Metal to Conduct Cold
Composite toe, non-metallic puncture plate, and non-metallic shank: there is no steel in the Siberian's structure to pull cold into the foot, which matters more in a -40° boot than in any other. It also keeps the boot lighter.
Why Choose the TB0A63PUEM4?
A waterproof, 600g-insulated, -40°-rated composite-toe boot with a puncture-resistant plate, CSA certification, and an aerogel footbed — the Siberian is the Timberland PRO for the coldest work you do.
Similar Styles to Consider
Working in cold that isn't extreme? The Boondock 8" TB189628214 carries 600g Thermolite® with a rubber toe guard on a Goodyear® welt. Want dial-in fit with 400g? See the BOA® Boondock 8" TB0A67B3W02.
Shop more: Timberland PRO Insulated Boots, Timberland PRO 8 Inch Boots, Timberland PRO Safety Toe, Timberland PRO Waterproof
Frequently Asked Questions
How cold-rated is the Siberian?
Timberland certifies the TB0A63PUEM4 to -40°C / -40°F with 600 grams of insulation and an OrthoLite® O-Therm™ aerogel footbed. Insulation ratings interact with your circulation, sock choice, and how much you move, so treat it as a guide for stationary work in extreme cold rather than a temperature promise.
What safety certifications does the Siberian carry?
An ASTM F2413-rated composite safety toe, a non-metallic puncture-resistant plate, and CSA certification for Canadian jobsites.
What does the O-Therm™ aerogel footbed do?
Aerogel is one of the best insulators available by weight. Infused into the footbed, it forms a thermal barrier under the foot — the surface where most winter boots lose heat to frozen ground — so the 600g in the upper isn't undone from below.
Is the Siberian completely non-metallic?
Yes. The composite toe, non-metallic puncture plate, and non-metallic shank mean there is no steel in the boot's structure to conduct cold or add weight.
How should an extreme-cold boot fit?
Order the size you wear in athletic shoes and allow for the heavy winter sock you will wear; a boot that is snug compresses the insulation and the sock and runs colder. The composite cap does not stretch, so size for room across the toes from day one.
How does the Siberian compare to the insulated Boondock 8"?
Both are 8" waterproof, 600g-insulated, composite-toe Timberland PRO boots. The Siberian adds a -40° certification, an aerogel footbed, a puncture plate, and CSA approval for extreme cold; the Boondock TB189628214 adds a rubber toe guard, external heel cup, and a resoleable three-quarter Goodyear® welt for heavier industrial abuse.
