Z-Flex is the Most Durable & Protective Aluminization 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 X40 suit features a Z-Flex aluminized radiant shell, a foil layer for added radiant protection, fiberglass insulation to protect from exposure to conductive and convective heat, and an FR cotton liner for comfort. The X40 Ultra offers the same features as the standard X40, but it has a Quilted Nomex® liner instead of an FR cotton liner. The Quilted Nomex® provides superior protection against conductive and convective heat, almost doubling the Thermal Protective Performance (TPP) of the X40 suit. All X Series suits are designed to be worn over standard industrial work wear. It is important for users to wear long-sleeve shirts and pants made with non-flammable fibers.

The X40 can be used in a wide range of industries and applications including in the casting, foundry, and petrochemical industries for kiln and oven operations and hot maintenance and repair operations.

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Product Image for Item #2100341

X40 Ultra Insulated Proximity Suit

  • Item: 2100341
  • Weight: 30.00 lbs14 kgs
  • Size: Small - 2XL
  • Style: X40 Ultra
  • Ambient Temp: 800 °F430 °C
  • Radiant Temp: 3000 °F1650 °C
Product Image for Item #2100338

X40 Insulated Proximity Suit

  • Item: 2100338
  • Weight: 30.00 lbs14 kgs
  • Size: Small - 2XL
  • Style: X40
  • Ambient Temp: 800 °F430 °C
  • Radiant Temp: 3000 °F1650 °C

Suit Construction

  • Z-Flex A-601 aluminized glass outer shell
  • Z-Flex AF F-628 Foil
  • Fiberglass insulation
  • FR cotton liner (X40) OR Quilted Nomex liner (X40 Ultra)


Testing & Certification

The suit lay-up meets the ISO 11612 Standard

The Z-Flex® shell 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
  • Abrasion Tear Resistance: ISO 13937 / EN 388



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



  • The total weight of the jacket and pants is approximately 16 lbs (7.3 kg).
  • The total weight of the entire ensemble (jacket, pants, hood, gloves, and boots) is approximately 25 lbs (11.3 kg).

Suit Features

  • Zipper and velcro double storm fly closure
  • Cinch at waist for athletic fit
  • Integrated breathing pouch to accomodate SCBA
  • Raglan sleeves for freedom of movement
  • Optional: Pockets with flap closure
  • Sewn-in suspenders for adjusting pant drop
  • Adjustable leg opening for easy donning
  • Dome style hood
  • Hard cap with ratchet adjustment*
  • Full shoulder length drape with elasticized underarm straps
  • Rounded bib for improved range of motion
  • Polycarbonate lens with a gold film
  • Two wing locks hold the lens and retainer securely in place
  • Gauntlet style aluminized gloves
  • 3-Finger design for superior dexterity and insulation
  • ZetexPlus palm and thumb for protection from direct contact with hot objects
  • Elastic cuff for a tight seal 
  • New easy-on design
  • Adjustment straps for fit
  • For wear over work boots
Also Included
  • Ballistic nylon duffle bag for storage
  • Nomex® balaclava
* Hard cap meets ANSI-Z89.1-2009 impact resistance tests