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Bell 4Forty Air MIPS

Bell 4Forty Air MIPS
  • Color: Fasthouse Matte Gray/Black
  • Color: Matte Black
  • Color: Matte Black Camo
  • Color: Matte Blue/Hi-Viz
  • Color: Matte Gray/Red
  • Color: Matte Titanium/Charcoal
  • Color: Matte White/Black
Please select options


Equipped with pro-level technology but designed with the privateer in mind, the Bell 4Forty Air MIPS is the first choice for your next trail helmet.

Trail Life
The 4Forty Air MIPS is equipped with pro-level features designed with the privateer in mind. With a sleek new shell and 3-position visor, the benefits aren't just visibly rad but functionally significant for increased air ventilation, effective sweat management, and better goggle compatibility. Our Float Fit system, built-in Sweat Guide, and Ionic+ padding ensures all-day comfort, while Integrated MIPS and extended hard-shell coverage help you stay committed in all shred conditions. Upgrades like eyewear ports, a Fidlock magnetic buckle, and premium straps make the 4Forty Air MIPS your go-to for daily trail riding. [Availability, certification, color, and pricing may vary per region. If outside of the USA, please check with your authorized local dealer for more information.]

- INTEGRATED MIPS—Integrated MIPS (Multi-Directional Impact Protection System) is designed to reduce rotational forces that can result from certain impacts. By integrating the MIPS slip plane into the retention system, we are able to reduce complexity and weight for a compact, better ventilated helmet that fits more closely to the head.
- FLOAT FIT—A minimalist, lightweight fit system with an easy-to-turn rubber overmolded dial for adjustments (integrated with MIPS).
- FIDLOCK BUCKLE—Fidlock is an easy-to-use magnetic buckle. This time saving feature slides closed laterally for an effortless, secure fit.
- NO-TWIST TRI-GLIDES—Quick-adjust fasteners that help keep straps flat and properly positioned
- SWEAT GUIDE—Sweat Guide pad design pulls moisture away from the brow pad and away from eyewear.
- IONIC+ PADDING—Quick-drying interior padding helps manage sweat while fighting odor-causing bacteria.
- 3-POSITION ADJUSTABLE VISOR—3-position adjustable visor allows for sun protection and integrates easily with goggles or glasses.
- GOGGLE GRIPPER—Rubber grip on the back of the helmet keeps your goggle strap in place.
- EYEWEAR STORAGE—Easily stash your glasses using the integrated helmet notches.

Complies with the US CPSC Safety Standard for Bicycle Helmet for Persons Age 5 and Older

S 52-56 20 1/2"– 22" 6 1/2"– 7"
M 55-59 21 5/8"– 23 1/4" 6 7/8"– 7 3/8"
L 58-62 22 3/4"– 24 3/8" 7 1/4"– 7 3/4"
XL 61-65 24"– 25 5/8" 7 5/8"– 8 1/8"


Part Numbers

Option UPC MPN Store SKU
Fasthouse Matte Gray/Black / Small 196178094436 7151295 4FO22361675S
Fasthouse Matte Gray/Black / Medium 196178094443 7151296 4FO22373629M
Fasthouse Matte Gray/Black / Large 196178094450 7151297 4FO22931455L
Matte Black / Small 768686471933 7139320 4FO19796350S
Matte Black / Medium 768686471940 7139321 4FO1994064M
Matte Black / Large 768686471957 7139322 4FO19290648L
Matte Black / X-Large 768686471964 7139323 4FO20478491L
Matte Black Camo / Small 768686471834 7138534 4FO22784715S
Matte Black Camo / Medium 768686471841 7138535 4FO22766302M
Matte Black Camo / Large 768686471858 7138536 4FO22600001L
Matte Blue/Hi-Viz / Small 768686472039 7139340 4FO21526897S
Matte Blue/Hi-Viz / Medium 768686472046 7139341 4FO21964963M
Matte Blue/Hi-Viz / Large 768686472053 7139342 4FO21399081L
Matte Gray/Red / Small 768686471971 7139328 4FO23140505S
Matte Gray/Red / Medium 768686471988 7139329 4FO23843654M
Matte Gray/Red / Large 768686471995 7139330 4FO23243834L
Matte Titanium/Charcoal / Small 768686471896 7138564 4FO21948298S
Matte Titanium/Charcoal / Medium 768686471902 7138565 4FO21511952M
Matte Titanium/Charcoal / Large 768686471919 7138566 4FO21862298L
Matte Titanium/Charcoal / X-Large 768686471926 7138567 4FO22768484L
Matte White/Black / Small 768686472008 7139334 4FO21297473S
Matte White/Black / Medium 768686472015 7139335 4FO21314695M
Matte White/Black / Large 768686472022 7139336 4FO21505537L