Z-Flex is the Most Durable & Protective Aluminized Fabric Available

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An insulated suit for conductive, convective & radiant heat

The X40 Insulated Proximity Suit is a moderately insulated aluminized suit designed for industrial applications.

The suit features a Z-Flex® aluminized outer shell which reflects 95% of radiant heat and withstands radiant temperatures up to 3000°F (1650°C). In addition to providing outstanding protection, Z-Flex® is also the most durable aluminized material available and will not de-laminate under even the most demanding conditions. A foil layer beneath the outer shell acts as a secondary defense against radiant heat, and a layer of fiberglass insulation provides protection even during extended exposure to extreme temperatures. The Quilted Nomex® thermal liner provides superior protection from conductive and convective heat.

This suit can be used in a wide range of industries including foundries, petrochemical plants, processing facilities, and other environments where workers are exposed to extreme temperatures.

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X40 Insulated Proximity Suit

  • Item: 2100341
  • Weight: 30.00 lbs14 kgs
  • Size: Medium - 2XL
  • Style: X40 Ultra
  • Ambient Temp: 800 °F430 °C
  • Radiant Temp: 3000 °F1650 °C

Suit Construction

Radient Shell
  • Z-Flex A-601 Aluminized Texturized Fiberglass
Insulation Layers
  • Z-Flex® F-628 AF Foil & Fiberglass Insulation
Thermal Liner
  • Quilted Nomex® liner

Testing & Certification

The X40 Insulated Proximity Suit meets the requirements of the ISO 11612 test standard.

The Z-Flex® shell also meets or exceeds the following:
  • Radiant Heat: ISO 6942 / EN 366 / ASTM F1939
  • Convective Heat: ISO 9151 / EN 367
  • Limited Flame Spread: ISO 15025 / EN 532
  • Molten Metal: ISO 9185 / EN 348 / ASTM F955
  • Tear Resistance: ISO 13937 / EN 388


  • The X40 Insulated Proximity Suit is available in sizes Medium, Large, and X-Large.
  • 2XL and custom sizes are available for an additional charge.
  • See our Sizing Chart for more information.


  • Jacket & Pants Only*: 16 lbs (7.3 kg)
  • Total Ensemble*: 25 lbs (11.3 kg)
*Weights are approximate. Actual weights may vary.

Ensemble Features

  • Zipper closure & velcro storm fly
  • Cinch at waist for athletic fit
  • Pouch for SCBA
  • Optional: Pockets with flap closure
  • Suspenders for adjustable length
  • Cinch on cuffs for adjustment
  • Easy-on design
  • For wear over work boots
  • Leather sole for grip
  • Hard cap with ratchet adjustment*
  • Full shoulder length drape
  • Polycarbonate lens with gold film
  • Rounded bib & elasticized straps
  • Three finger gauntlet style
  • Aluminized back & ZetexPlus palm
Also Included
  • Ballistic nylon duffle bag for storage
  • Nomex® balaclava
* Hard cap meets ANSI-Z89.1-2009 impact resistance tests