Bell 4Forty Air Mips Bike Helmet - Lightweight & Ventilated MTB Cycling Helmet with MIPS Technology for Men & Women | Perfect for Mountain Biking, Road Cycling & Commuting

@media (min-width:992px) {.imageSimpleGrid_row { display: flex; align-items: center; justify-content: center;}.imageSimpleGrid_image-wrap { max-width: 60%; width: 100%;}.imageSimpleGrid_content-wrap { width: 100%; max-width: 481px; padding: 0 0 0 50px;} .imageSimpleGrid { padding: 0 0 3em;}} .imageSimpleGrid_image-wrap figure { height: auto;}.image-hover-scale:hover img { transform: scale3d(1.075, 1.075, 1);}.imageSimpleGrid_row.reverse { flex-direction: row-reverse;}.description img { max-width: 100%; height: auto !important;} .boa_product .m-top { margin-top: 4em;}.imageSimpleGrid { padding: 15px 0;}p.product__text.text-center { font-size: 1.3em !important;} .feature-title { font-weight: 700; line-height: 1.4; margin: 1em auto 0.5em; font-size: 1.1em; text-transform: uppercase;} .feature-text { line-height: 1.8; padding-bottom: 15px;} .reverse .imageSimpleGrid_content-wrap { padding: 0 50px 0 0;}.image-hover-scale { overflow: hidden;} .panel-product .panel-body .product__blurb .product__text { font-size: 1.3em !important;}.image-hover-scale:hover > img { transition: transform 0.5s ease 0.05s, opacity 0.3s !important; transform: scale3d(1.075, 1.075, 1); } .image-hover-scale * { transition: all 0.2s ease-out; } .image-hover-scale:hover img { transform: scale3d(1.075, 1.075, 1); }

TRAIL-TESTED COMFORT - PRO-LEVEL FEATURES

The Bell 4Forty Air Mips is a trail rider's dream—engineered with advanced protection, all-day comfort, and sleek functionality to keep you shredding with confidence. Designed for privateers and enthusiasts alike, this helmet is your next go-to for conquering trails.

Trail-Ready - Advanced Features - Lightweight

Engineered for Performance

 

Crafted with a Fusion In-Mold polycarbonate shell and Mips® Evolve technology, the Bell 4Forty Air Mips ensures lightweight impact protection while reducing rotational forces. This compact, ventilated helmet prioritizes your safety without compromising style or fit.

All-Day Comfort - Sweat Control - Precision Fit

Comfort You Can Count On

 

Stay comfortable and focused with the Float Fit™ system and Fidlock® magnetic buckle, offering quick, secure adjustments. Paired with Ionic+™ antimicrobial padding and the Sweat Guide™, you’ll ride longer without irritation or discomfort.

Goggles & Glasses Compatible - Adjustable Visor - Secure Straps

Trail-Ready Features

 

The 3-position adjustable visor, eyewear storage ports, and goggle gripper deliver unbeatable functionality for any trail condition. No-Twist Tri-Glides™ keep your straps flat and properly positioned, so you can stay in control at every turn.

Premium Details - Durable Design - Enhanced Ventilation

Designed to Excel

 

Weighing only 360g (Size M), this helmet is packed with premium upgrades like extended hard-shell coverage, superior ventilation, and an ergonomic design, ensuring it’s as ready for the trail as you are.

Feature	Details
Impact Management	Mips® Evolve
Construction	Fusion In-Mold polycarbonate shell
Visor	3-Position adjustable
Fit System	Float Fit™ with Fidlock® Magnetic Buckle
Weight	360g (Size M)
Certification	Complies with US CPSC Safety Standard

Size Guide