Quatro Dielectric Safety Knee


High-spec, fully waterproof, hand-built, rubber dielectric safety boot. Manufactured with specially formulated insulating layers offering electrical protection over the whole boot. Yellow upper allows for easier visual identification. Built with a generous fit, while also locking the ankle and preventing heel slip.

Certification information sheet

Size Foot length (mm) Product code
Mens 4 / Womens 6 242 FQE404
Mens 5 / Womens 7 250 FQE405
Mens 6 / Womens 8 258 FQE406
Mens 7 / Womens 9 265 FQE407
Mens 8 / Womens 10 274 FQE408
Mens 9 / Womens 11 284 FQE409
Mens 10 292 FQE410
Mens 11 300 FQE411
Mens 12 309 FQE412
Mens 13 317 FQE413
Mens 14 326 FQE414
Measuring guide
How to accurately measure your foot at home

It’s best to try on boots for the perfect fit, but when it’s not possible, follow our guide below.

You’ll need:

  • Paper, or other flat surface you can draw on
  • Pen
  • Measuring tape or ruler
  • Flat wall and floor


  1. Place heel of foot and paper against the wall
  2. Trace around the foot with pen
  3. Use tape measure or ruler to measure length from heel to longest toe


  • Between sizes? Choose the larger size. Thicker socks and innersoles can help get a snug fit if needed, and feet can expand up to 1cm during an active or a warm day.
  • Most people have one foot slightly longer than the other, it’s important to do both feet, then select the larger measurements.

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