Color: Matte Amethyst
Size: S


MTB helmet updated with Koroyd

Helmet for MTB popular for its simple looks and fit.Engage updates with colloid from 2023. Equipped with a system that combines MIPS and an adjustable fit that enables a safe and comfortable fit. This system enhances safety and fit. Sunglasses can be stored in the front air channel, and the 3-stage visor position is excellent for using goggles.

In addition, XL size has been added to enhance the size variation.


SIMTH OPTICS / Smith Optics

In 1965, orthodontist and powder eater Bob Smith began handcrafting double-lens goggles in his home warehouse out of breathable foam. It was the start of the brand that I started selling at resort areas in Utah and Colorado on the weekends when I skied as a hobby. Even now, many processes are handmade and continue to be produced at factories in the United States. Even now, more than 50 years after its founding, we are still good at developing products that use innovative technology to focus on play, and even helmets and sunglasses use mechanisms that are not seen in other manufacturers.


Koroyd®︎ / Colloid

Among the lineup of SIMTH OPTICS helmets, it is adopted for models above middle grade.Koroyd®︎ / Colloid. This honeycomb structure material absorbs 48% more impact than conventional EPS alone, and efficiently dissipates the heat trapped inside the helmet.



  • Lightweight in-mold structure
  • Adoption of patented colloidal material in some zones = high shock absorption and ventilation
  • MIPS standard equipment
  • Adjustable fit system
  • 21 ventilations
  • Comfortable performance lining
  • Ultralight single strap
  • Air back type ventilation
  • Equipped with a 3-position variable visor
  • Fusion shape compatible with sunglasses and goggles



Weight (M size): 350g



S 51 - 55 cm
M 55 - 59 cm
L 59 - 62 cm
  1. We ship within 1-2 business days after receiving your order (payment). (Basically, orders placed before 12:00 p.m. are shipped the same day.)
  2. Messenger delivery is available within Nagoya City only.
  3. We ship every day from Monday to Sunday, except on temporary holidays.
  4. Available delivery areas: All over Japan and the world.
  5. Please note that delivery may be delayed due to credit card processing status. If you would like to specify the delivery date and time, please fill in your request in the additional information in the shopping cart.
  6. The product will be shipped from Circles.
  7. Please contact the shipping company in case of damage or loss during shipping.

Regarding the delivery of complete bikes

  • Please note that a separate shipping fee of 9,900 yen (tax included) will be charged for shipping complete bikes. (However, an additional fee will be charged for delivery to Okinawa and remote islands.)
  • After receiving your order, we will do a final check and ship complete bikes, but it may take 1-2 weeks. Please understand.
  • We will send the bike with some parts removed for packing. We strongly recommend that you have your bicycle assembled at your nearest bicycle store.
  • We will inform you of the delivery date and other details by e-mail.
  • We apologize for any sales discrepancies at the store.

Regarding the delivery of frame sets

  • Nationwide flat-rate shipping: 5,500 yen (tax included) (However, an additional fee will be charged for delivery to Okinawa and remote islands.)
  • We will inform you of the delivery date and other details by e-mail.
  • We will provide the pre-treatment of facing and tapping for the frame sets purchased at our store as a service. We will inform you separately after purchase.
  • We can also install a headset and BB for a fee, so please feel free to contact us.

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