{"product_id":"mcr-safety-mu3664k-xl-mustang-hidex-goatskin-kevlar-fr-gloves-xlarge","title":"MCR Safety MU3664K-XL Mustang HiDex Goatskin Kevlar FR Gloves — X-Large","description":"\u003c!-- Title: MCR Safety MU3664K-XL Mustang HiDex Goatskin Kevlar FR Gloves — X-Large | SKU: MU3664K-XL | ID: 8747972198488 --\u003e\n\n\u003cp\u003eFor X-Large-handed workers in electrical utility, oil and gas, and industrial maintenance environments requiring a flame-resistant leather driver glove that performs across demanding field conditions, the \u003cstrong\u003eMCR Safety MU3664K-XL Mustang HiDex Goatskin Kevlar FR Gloves in X-Large (\u003cstrong\u003eSKU: MU3664K-XL\u003c\/strong\u003e)\u003c\/strong\u003e provide the right combination of FR performance, goatskin dexterity, and Kevlar structural integrity. X-Large is the second-highest-demand size in utility and heavy industrial driver gloves, serving the significant portion of the workforce with 10–11 inch hand circumferences. The Mustang HiDex platform balances protection against operational usability — ensuring that workers in the field maintain dexterity for valve operation, tool handling, and precision electrical work.\u003c\/p\u003e\n\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003ePremium goatskin leather palm — soft, naturally dexterous, and thermally resistant to radiant and conductive heat\u003c\/li\u003e\n  \u003cli\u003eFlame-resistant Kevlar liner — inherent aramid FR performance that does not diminish with repeated laundering\u003c\/li\u003e\n  \u003cli\u003eFR-treated leather back — full hand flame resistance for arc flash and flash fire scenarios\u003c\/li\u003e\n  \u003cli\u003eSize: X-Large — fits hand circumference approximately 10–11 inches\u003c\/li\u003e\n  \u003cli\u003eDriver glove cuff profile — wrist-length construction for utility and maintenance applications\u003c\/li\u003e\n  \u003cli\u003eHiDex platform construction — engineered for dexterity retention at protection level\u003c\/li\u003e\n  \u003cli\u003eSeries: Mustang HiDex (MU3664K)\u003c\/li\u003e\n  \u003cli\u003eBrand: MCR Safety, ISO 9001-certified\u003c\/li\u003e\n  \u003cli\u003eCompliance: FR — NFPA 70E arc flash PPE compatible\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eDetailed Description\u003c\/h2\u003e\n\u003cp\u003eX-Large is the critical size in utility and industrial driver glove procurement because it sits at the demographic midpoint of most field workforce populations in energy, oil and gas, and heavy maintenance sectors. Procuring insufficient X-Large inventory — or specifying an X-Large glove that fits poorly — creates compliance gaps in these environments where FR hand protection is a mandatory PPE requirement under NFPA 70E, API RP 2G, and facility-specific hot work procedures. The MU3664K-XL is engineered to the X-Large hand geometry — 10–11 inch circumference — with the HiDex platform's pattern optimization ensuring proper coverage at the palm heel, finger transitions, and thumb web without the material excess that causes restriction in poorly sized X-Large leather gloves.\u003c\/p\u003e\n\n\u003cp\u003eGoatskin leather at the X-Large scale presents the same engineering challenges as any large-pattern leather work glove: maintaining consistent grain density and thickness across a larger surface area. MCR Safety's goatskin sourcing and processing specifications for the MU3664K series prioritize consistent hide quality and uniform thickness across the palm and finger panels. Inconsistent leather thickness in an X-Large pattern creates differential heat transfer rates — thinner areas conduct heat more rapidly, creating localized burn exposure risk that nullifies the protection intended by the FR specification. Consistent thickness across the MU3664K-XL's larger palm area ensures uniform thermal protection regardless of contact angle or pressure point.\u003c\/p\u003e\n\n\u003cp\u003eFor electrical utility workers performing live-line maintenance or switching operations, the MU3664K-XL serves as a leather protector glove over Class 00 through Class 2 rubber insulating gloves. In NFPA 70E arc flash PPE programs at incident energy levels up to 8–12 cal\/cm², the leather protector and rubber insulating glove combination provides both voltage insulation and arc flash thermal protection. The X-Large sizing allows the MU3664K-XL to fit properly over the thickness of rubber insulating gloves in most X-Large hand applications, though users should verify specific circumference compatibility for their combination of rubber glove model and hand size.\u003c\/p\u003e\n\n\u003cp\u003eIn oil and gas operations, the MU3664K-XL addresses the combined hazard profile of hydrocarbon flash fire, high-temperature equipment contact, and mechanical abrasion from pipe handling and valve operation. Goatskin leather at the X-Large pattern provides the abrasion resistance needed for pipe string handling and rig floor operations while maintaining the suppleness required for tool manipulation and equipment connections. The Kevlar liner ensures that thermal events that degrade the outer leather layer do not immediately expose the skin to secondary injury, providing a secondary heat barrier during the intervention window after initial flash fire exposure.\u003c\/p\u003e\n\n\u003ch2\u003eApplications and Use Cases\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eElectrical utility line work — leather protector over rubber insulating gloves in NFPA 70E programs\u003c\/li\u003e\n  \u003cli\u003eOil and gas rig floor operations with flash fire and mechanical abrasion hazards\u003c\/li\u003e\n  \u003cli\u003ePipeline maintenance, valve operation, and hot work in refineries and processing plants\u003c\/li\u003e\n  \u003cli\u003eIndustrial welding support and cutting operations requiring FR leather hand protection\u003c\/li\u003e\n  \u003cli\u003eForestry operations with chainsaw adjacent hazards and burn exposure risk\u003c\/li\u003e\n  \u003cli\u003eMilitary and first responder support requiring dexterous FR leather driver gloves\u003c\/li\u003e\n  \u003cli\u003eIndustrial maintenance involving hot surfaces, steam equipment, and heat-generating machinery\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003ctable border=\"1\" cellpadding=\"6\" cellspacing=\"0\" style=\"border-collapse:collapse;width:100%;\"\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eAttribute\u003c\/th\u003e\n      \u003cth\u003eDetail\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003eMU3664K-XL\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eProduct ID\u003c\/td\u003e\n\u003ctd\u003e8747972198488\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSize\u003c\/td\u003e\n\u003ctd\u003eX-Large (hand circumference 10–11 in.)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePalm Material\u003c\/td\u003e\n\u003ctd\u003ePremium Goatskin Leather\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eLiner\u003c\/td\u003e\n\u003ctd\u003eFlame-Resistant Kevlar\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBack Material\u003c\/td\u003e\n\u003ctd\u003eFR-Treated Leather\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCuff Style\u003c\/td\u003e\n\u003ctd\u003eDriver (Wrist-Length)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003eMustang HiDex (MU3664K)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eMCR Safety\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eCompliance\u003c\/td\u003e\n\u003ctd\u003eFR — NFPA 70E Compatible\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePrimary Applications\u003c\/td\u003e\n\u003ctd\u003eElectrical Utility, Oil and Gas, Industrial Maintenance\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eSold As\u003c\/td\u003e\n\u003ctd\u003ePer pair\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eRelated Products\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/collections\/leather-work-gloves\"\u003eLeather Work Gloves — Full Collection\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/collections\/work-gloves\"\u003eWork Gloves — General Industrial\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/collections\/welding-gloves\"\u003eWelding Gloves — Heat and Spark Protection\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/collections\/mcr-safety\"\u003eMCR Safety — Complete Product Line\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/collections\/mechanics-gloves\"\u003eMechanics Gloves — Assembly and Precision Work\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What hand size does the MU3664K-XL fit?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The MU3664K-XL is designed for X-Large hands with a circumference of approximately 10 to 11 inches measured around the knuckles excluding the thumb. The HiDex platform pattern is engineered specifically for X-Large hand geometry, providing proper coverage at the palm, finger transitions, and thumb web without excess material restriction.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Can the MU3664K-XL be used as a leather protector in NFPA 70E arc flash programs?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Yes. The MU3664K-XL's goatskin leather construction meets the leather protector requirements of NFPA 70E for use over Class 00 through Class 2 rubber insulating gloves. The X-Large size accommodates most X-Large-handed workers using standard rubber insulating glove profiles, though specific circumference compatibility should be verified for your glove combination.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Is the FR performance of the MU3664K-XL maintained after repeated laundering?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The Kevlar liner's FR performance is inherent to the aramid fiber structure and does not diminish with laundering. The outer leather's FR treatment should be evaluated periodically — if the leather surface is significantly cracked or worn, the FR treatment effectiveness at the surface may be reduced. Replace when leather integrity is compromised.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"How does the MU3664K-XL perform for valve operation and tool handling in oil and gas?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"The goatskin palm's natural suppleness provides excellent feedback for valve handwheel operation and hand tool manipulation in oil and gas environments. X-Large-handed workers in rig floor and pipeline maintenance roles typically find the MU3664K-XL's fit and flexibility superior to stiffer cowhide alternatives at equivalent protection levels. The glove provides the dexterity needed for threaded connection work and gauge reading tasks.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"What is the service life expectancy for the MU3664K-XL in daily field use?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Service life varies significantly by application intensity. In electrical utility switching operations with limited mechanical abrasion, the MU3664K-XL typically provides 2–4 weeks of daily use before requiring replacement due to leather surface wear. In oil and gas rig floor operations with high-abrasion pipe handling, service life may be 1–2 weeks. Inspect weekly for leather cracking, palm thinning, and seam integrity.\"\n      }\n    },\n    {\n      \"@type\": \"Question\",\n      \"name\": \"Does the MU3664K-XL require break-in time before full dexterity is available?\",\n      \"acceptedAnswer\": {\n        \"@type\": \"Answer\",\n        \"text\": \"Goatskin leather does require a brief break-in period to conform fully to the individual hand's shape. Most workers find the MU3664K-XL reaches optimal dexterity after 4–8 hours of use as the goatskin softens and shapes to the specific hand geometry. This break-in period is significantly shorter than for heavier cowhide or pigskin leather gloves.\"\n      }\n    }\n  ]\n}\n\u003c\/script\u003e\n\n\u003cdl\u003e\n  \u003cdt\u003eWhat hand size does the MU3664K-XL fit?\u003c\/dt\u003e\n  \u003cdd\u003eThe MU3664K-XL is designed for X-Large hands with a circumference of approximately 10 to 11 inches measured around the knuckles excluding the thumb. The HiDex platform pattern is engineered specifically for X-Large hand geometry, providing proper coverage without excess material restriction.\u003c\/dd\u003e\n\n  \u003cdt\u003eCan the MU3664K-XL be used as a leather protector in NFPA 70E arc flash programs?\u003c\/dt\u003e\n  \u003cdd\u003eYes. The MU3664K-XL's goatskin leather construction meets the leather protector requirements of NFPA 70E for use over Class 00 through Class 2 rubber insulating gloves. Verify specific circumference compatibility for your glove combination.\u003c\/dd\u003e\n\n  \u003cdt\u003eIs the FR performance of the MU3664K-XL maintained after repeated laundering?\u003c\/dt\u003e\n  \u003cdd\u003eThe Kevlar liner's FR performance is inherent to the aramid fiber structure and does not diminish with laundering. The outer leather's FR treatment should be evaluated periodically — replace when leather integrity is significantly compromised.\u003c\/dd\u003e\n\n  \u003cdt\u003eHow does the MU3664K-XL perform for valve operation and tool handling in oil and gas?\u003c\/dt\u003e\n  \u003cdd\u003eThe goatskin palm's natural suppleness provides excellent feedback for valve handwheel operation and hand tool manipulation. X-Large-handed workers in rig floor and pipeline maintenance roles typically find the MU3664K-XL's fit and flexibility superior to stiffer cowhide alternatives at equivalent protection levels.\u003c\/dd\u003e\n\n  \u003cdt\u003eWhat is the service life expectancy for the MU3664K-XL in daily field use?\u003c\/dt\u003e\n  \u003cdd\u003eIn electrical utility switching operations, the MU3664K-XL typically provides 2–4 weeks of daily use. In oil and gas rig floor operations with high-abrasion pipe handling, service life may be 1–2 weeks. Inspect weekly for leather cracking, palm thinning, and seam integrity.\u003c\/dd\u003e\n\n  \u003cdt\u003eDoes the MU3664K-XL require break-in time?\u003c\/dt\u003e\n  \u003cdd\u003eGoatskin leather requires a brief break-in period — typically 4–8 hours of use — before reaching optimal dexterity as the leather softens and conforms to the hand. This is significantly shorter than for heavier cowhide or pigskin alternatives.\u003c\/dd\u003e\n\u003c\/dl\u003e","brand":"MCR Safety","offers":[{"title":"Default Title","offer_id":44028723167320,"sku":"MU3664K-XL","price":38.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0594\/1900\/0920\/files\/38911__44600.1738178244_f26ecbc8-b89b-4472-b289-b6e19e8ab99a.webp?v=1777043310","url":"https:\/\/wcsafety.com\/products\/mcr-safety-mu3664k-xl-mustang-hidex-goatskin-kevlar-fr-gloves-xlarge","provider":"WC Safety","version":"1.0","type":"link"}