Bell 4Forty MIPS Cycling Helmet - Matte/Gloss Blue Atoll

The 4Forty helmet is built to withstand the rigors of off-road riding and rugged trails. Its quality is equal to helmets that cost twice as much: it has a deep profile covering the back of the head, is perfectly ventilated, fits perfectly on the head thanks to the Float Fit clamping system and has an adjustable visor. A variant with MIPS technology that provides increased protection against rotational forces on the head. More

2 999 Kč
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Basic informations

Category Cycling MTB helmets
Determination men's, women's
Brand Bell
Catalog number 39281-468

Technical parameters

Helmet size M-(55-59), L-(58-62)
Color turquoise
Construction In-mold Polycarbonate Shell, MIPS
Season 2026
Execution peak
Advanced level racing, sporty
Buildable size adjustable
Other Sweat Guide, adjustable label, Float Fit fastening system
Sizes S (52–56 cm), M (55–59 cm), L (58–62 cm), XL (61–65 cm)
Weight 363 g
Ventilation 15 holes, Channeled Ventilation
Certification CE EN1078

Product description

Mountain biking is a demanding sport - compromising on equipment is definitely not a good idea. The 4Forty helmet is built to withstand the rigors of the trails. Its quality is equal to helmets that cost twice as much: it has a deep profile covering the back of the head, is perfectly ventilated, fits perfectly on the head thanks to the Float Fit clamping system and has an adjustable visor.

MIPS (Multi-Directional Impact Protection System) provides increased protection against rotational forces on the head. More atMIPSprilby.cz">www.MIPSprilby.cz.

Main advantages and specifications

  • SUPPORT SYSTEM: Float Fit (MIPS integration)
  • CONSTRUCTION: In-mold Polycarbonate Shell
  • VENTILATION: 15 holes, Channeled Ventilation
  • FEATURES: adjustable label, Sweat Guide
  • SIZE: S (52-56 cm), M (55-59 cm), L (58-62 cm)

All Bell helmets are designed to absorb as much energy as possible in the event of an impact and comply with the valid European standard: EN 1078.

MIPS - Multi-Directional Impact Protection System

MIPS is a slip liner between the EPS shell (helmet body) and the inner liners. In the event of an angled impact, the EPS shell of the helmet will roll a few millimetres over the MIPS layer, protecting the head and brain from the violent rotational jerk.
Although this movement is only on the order of a few millimeters, the result is that MIPS significantly reduces the amount of rotational force that might otherwise be transmitted to the brain.

Technology:

  • FLOAT FIT™ (Stratus, Catalyst, Formula, Drifter, Super 3R, Super 3, 4Forty and Hela) Minimalist clamping system that is easy to operate with a wheel. It also has the option of height adjustment.

  • FUSION IN-MOLD POLYCARBONATE SHELL Technology of direct injection of EPS polystyrene foam into the shell and reinforcements enclosed in the mould. This way a very strong, durable and compact unit is achieved. Bell's original technology, which has become the standard.

Size chart

Size chart

About brand Bell

Specialist in bicycle helmets with a tradition since 1956.

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