{"product_id":"timberland-pro-mens-siberian-csa-8-comp-toe-wp-insulated-work-boot-brown-tb0a63puem4","title":"Timberland PRO® Men’s Siberian CSA 8” Composite Toe Insulated Work Boot – Brown (TB0A63PUEM4)","description":"\u003ch3\u003eTimberland PRO Siberian CSA 8\" Composite Toe Waterproof 600G Insulated Work Boot — Brown — TB0A63PUEM4\u003c\/h3\u003e\n\u003cp class=\"pdp-description-short\"\u003eWhen temperatures drop, the Siberian is built to keep you working — 600 grams of insulation, certified for cold as low as -40°C \/ -40°F.\u003c\/p\u003e\n\u003cp class=\"pdp-description-long\"\u003eA 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.\u003c\/p\u003e\n\u003ch2\u003eKey Features of the Timberland PRO TB0A63PUEM4\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAsymmetrical Composite Safety Toe\u003c\/strong\u003e — Lightweight, non-metallic protection meeting ASTM F2413 impact and compression standards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCSA-Certified Protection\u003c\/strong\u003e — Designed to meet Canadian jobsite safety standards.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-Metallic Puncture-Resistant Plate\u003c\/strong\u003e — Underfoot protection from nails and sharp debris.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e600 Grams of Insulation\u003c\/strong\u003e — Certified to -40°C \/ -40°F for extreme-cold work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Full-Grain Waterproof Leather with Waterproof Membrane\u003c\/strong\u003e — Keeps snow and moisture out.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOrthoLite® O-Therm™ Aerogel Footbed\u003c\/strong\u003e — An aerogel-infused thermal barrier that blocks cold transfer from the ground.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreathable Flannel Lining\u003c\/strong\u003e — Moisture-wicking warmth against the foot.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNon-Metallic Shank\u003c\/strong\u003e — Structural support with no metal to conduct cold.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e8\" Height\u003c\/strong\u003e — Coverage against snow and slush. Imported.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eBuilt for Extreme Cold\u003c\/h3\u003e\n\u003cp\u003e600 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.\u003c\/p\u003e\n\u003ch3\u003eNothing Metal to Conduct Cold\u003c\/h3\u003e\n\u003cp\u003eComposite 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.\u003c\/p\u003e\n\u003ch2\u003eWhy Choose the TB0A63PUEM4?\u003c\/h2\u003e\n\u003cp\u003eA 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.\u003c\/p\u003e\n\u003ch3\u003eSimilar Styles to Consider\u003c\/h3\u003e\n\u003cp\u003eWorking in cold that isn't extreme? The \u003ca href=\"\/products\/timberland-pro-mens-boondock-8-comp-toe-wp-ins-work-boot-tb189628214\"\u003e\u003cstrong\u003eBoondock 8\" TB189628214\u003c\/strong\u003e\u003c\/a\u003e carries 600g Thermolite® with a rubber toe guard on a Goodyear® welt. Want dial-in fit with 400g? See the \u003ca href=\"\/products\/timberland-pro-mens-boa-boondock-8-comp-toe-wp-work-boot-black-tb0a67b3w02\"\u003e\u003cstrong\u003eBOA® Boondock 8\" TB0A67B3W02\u003c\/strong\u003e\u003c\/a\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShop more:\u003c\/strong\u003e \u003ca href=\"\/collections\/timberland-pro-insulated-boots\"\u003eTimberland PRO Insulated Boots\u003c\/a\u003e, \u003ca href=\"\/collections\/timberland-pro-8-inch\"\u003eTimberland PRO 8 Inch Boots\u003c\/a\u003e, \u003ca href=\"\/collections\/timberland-pro-safety-toe\"\u003eTimberland PRO Safety Toe\u003c\/a\u003e, \u003ca href=\"\/collections\/timberland-pro-waterproof\"\u003eTimberland PRO Waterproof\u003c\/a\u003e\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eHow cold-rated is the Siberian?\u003c\/h3\u003e\n\u003cp\u003eTimberland 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.\u003c\/p\u003e\n\u003ch3\u003eWhat safety certifications does the Siberian carry?\u003c\/h3\u003e\n\u003cp\u003eAn ASTM F2413-rated composite safety toe, a non-metallic puncture-resistant plate, and CSA certification for Canadian jobsites.\u003c\/p\u003e\n\u003ch3\u003eWhat does the O-Therm™ aerogel footbed do?\u003c\/h3\u003e\n\u003cp\u003eAerogel 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.\u003c\/p\u003e\n\u003ch3\u003eIs the Siberian completely non-metallic?\u003c\/h3\u003e\n\u003cp\u003eYes. 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.\u003c\/p\u003e\n\u003ch3\u003eHow should an extreme-cold boot fit?\u003c\/h3\u003e\n\u003cp\u003eOrder 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.\u003c\/p\u003e\n\u003ch3\u003eHow does the Siberian compare to the insulated Boondock 8\"?\u003c\/h3\u003e\n\u003cp\u003eBoth 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.\u003c\/p\u003e","brand":"Timberland Pro","offers":[{"title":"3.5 \/ Medium \/ Brown","offer_id":52704217301265,"sku":"197803894827","price":210.0,"currency_code":"USD","in_stock":true},{"title":"3.5 \/ Wide \/ Brown","offer_id":52704217334033,"sku":"197803895046","price":210.0,"currency_code":"USD","in_stock":true},{"title":"4 \/ Medium \/ Brown","offer_id":53229985792273,"sku":"197803895244","price":210.0,"currency_code":"USD","in_stock":true},{"title":"4 \/ Wide \/ Brown","offer_id":53229985825041,"sku":"197803895541","price":210.0,"currency_code":"USD","in_stock":true},{"title":"4.5 \/ Medium \/ Brown","offer_id":52704217432337,"sku":"197803895640","price":210.0,"currency_code":"USD","in_stock":true},{"title":"4.5 \/ Wide \/ 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