Quick answer

Choose the Giro Blok if you want the widest, most uninterrupted field of view and retro styling. Choose the Giro Tazz if you have a smaller or medium face and want a lower-profile goggle. In both models, the Vivid lens version is worth the upgrade when clarity and contrast matter more than saving money.

Frame size and field of view: the biggest practical difference

The Blok uses a larger frame built around Giro's Expansion View Technology (EXV), which gives it a very wide field of view. The Tazz uses a medium frame with the same EXV design, so it still offers a wide view but with a more minimal footprint. If you have a larger face or wear a full-face helmet with a wide eye port, the Blok's extra coverage can feel more natural. If you have a smaller face or prefer a goggle that doesn't dominate your face, the Tazz is the more comfortable starting point.

Standard vs Vivid lens: what you actually pay for

Both the Blok and Tazz come in a standard version with a tear-off compatible polycarbonate lens, and a Vivid version with a lens using Optics by ZEISS. The standard lens is a solid, budget-friendly choice for everyday trail riding. The Vivid lens is designed to improve clarity and contrast, which helps in changing light and busy terrain. The price difference is the main trade-off: the Vivid versions cost more, so decide whether sharper vision is worth it for the trails you ride most.

Ventilation and tear-offs: similar across the range

The Tazz is specifically noted for great ventilation and supervent foam, which helps keep air moving and reduces fogging on climbs. The Blok's catalog description focuses on its field of view and retro style rather than ventilation details. All four goggles listed here use a tear-off compatible lens, so if you race or ride in muddy conditions, you can run tear-offs on any of them. If fogging is your main concern, the Tazz's ventilation is the safer bet.

Decision rules for choosing your Giro MTB goggles

  • If you have a larger face or wide helmet eye port: Pick the Blok, in either standard or Vivid form. Its larger EXV frame gives the most uninterrupted field of view.
  • If you have a smaller or medium face: Pick the Tazz. Its medium frame is designed for a more minimal footprint and comfortable fit on a variety of face shapes.
  • If clarity and contrast are your top priority: Choose a Vivid lens version: the Blok with Vivid or the Tazz with Vivid Trail. Both use Optics by ZEISS for sharper vision. Check that the lens tint suits the light conditions you ride in most.
  • If you are budget-conscious: Choose the standard Blok or standard Tazz. Both have a tear-off compatible polycarbonate lens and the same EXV frame design.
  • If fogging is a frequent problem: Lean toward the Tazz, which is specifically noted for great ventilation and supervent foam.

Product facts at a glance

  • Giro Blok MTB Goggle with Vivid Lens: Cylindrical Vivid lens with Optics by ZEISS and a frame built around Expansion View Technology. This is the top-clarity Blok option for riders who want the widest view and are willing to pay more for the Vivid lens.

    Giro Blok MTB Goggle with Vivid Lens

    Giro Blok MTB Goggle with Vivid Lens

  • Giro Tazz MTB Goggles with Vivid Trail Lens: Medium frame with Expansion View Technology, a Vivid Trail lens and good ventilation. A strong choice for smaller faces or riders who prioritize airflow and a lower-profile fit without giving up lens quality.

    Giro Tazz MTB Goggles with Vivid Trail Lens

    Giro Tazz MTB Goggles with Vivid Trail Lens

  • Giro Blok MTB Goggle: Standard Blok with EXV frame and a tear-off compatible polycarbonate lens. The most affordable way to get the Blok's wide field of view if you don't need the Vivid lens upgrade.

  • Giro Tazz MTB Goggle: Medium Tazz frame with EXV, tear-off compatible lens and supervent foam. A budget-friendly medium-fit goggle with good ventilation for riders who want a simple, comfortable option.

Who should choose which

Best for

  • Riders with larger faces or full-face helmets who want maximum field of view (Blok)
  • Riders with smaller or medium faces who want a lower-profile goggle (Tazz)
  • Riders who prioritize lens clarity and are willing to pay more (Vivid versions)
  • Riders who want a straightforward, budget-friendly goggle (standard versions)

Not for

  • Riders who want the absolute lowest price and don't need a wide field of view (consider other budget goggles)
  • Riders who need prescription lenses (none of these models are listed as prescription-compatible)
  • Riders who want a specific lens tint for very bright or very low light (check available colour options before buying)