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Item # MTE0005

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Item # MTE0005

Quantified cooling.

In the past, choosing a helmet often came down to a dichotomous choice of aerodynamics or ventilation, speed or comfort. Nowadays, options such as the MET Estro Helmet let you choose both. Featuring large vents and a streamlined design, this helmet is simultaneously fast and cool.

To achieve this, MET didn't just aimlessly add air ports into the Estro's design. Instead, it developed a protocol that measures a helmets performance in terms of ventilation called Air Scale. Simply put, it measures two essential parameters -- the Head Contact Surface (HCS) and Cooling Factor (CF). The HSC indicates, with a percentage, how much of the head is in contact with the helmet. This lets MET design the HSC so it's at a minimum, in this case 65%. This helps the Estro decrease heat buildup and gives it a Cooling Factor of 7.5 out of ten.

A Safe-T Smart retention system holds the Estro snugly in place using a micro retention system that features both horizontal and vertical adjustment. This easy-to-adjust system distributes pressure across a broader surface than other retention systems to increase comfort. Inside, MET's Cocoon internal padding offers a soft and protective layer against your skin.

  • A streamlined helmet with ample airflow
  • Full wrap polycarbonate shell for added durability
  • Safe-T Smart adjustment system
  • Soft Cocoon internal padding

Tech Specs

Shell Material:
Impact Foam:
Fit Adjustment:
Safe-T Advanced
Recommended Use:
Manufacturer Warranty:
2 years

Size chart


Estro, Veleno
Head Circumference 21.2 - 22.4in
(54 - 57cm)
22.8 - 24in
(58 - 61cm)
Head Circumference 21.2 - 22.8in
(54 - 58cm)
23.2 - 24.4in
(59 - 62cm)
 One Size
Head Circumference 21.2 - 24in
(54 - 61cm)
How to Measure:
Measure around your head where your hat would fit comfortably.

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A solid mid-level helmet

  • Familiarity: I've used it several times
  • Fit: True to size
  • Size Bought: Large

This is a decent, serviceable helmet - nothing flashy, but good functionality and fit. Pretty light yet feels sturdy. The adjustable straps work well, but the plastic clip can get too near the earlobe if not positioned right. Like most helmets I've owned, the rear strap still manages to get twisted and I wish it stayed flush against the side of my head. Otherwise happy with it.