The Bell 4Forty Air SOLID MIPS MTB Helmet is a premium trail lid engineered for riders who spend long hours on the bike and demand exceptional ventilation without compromising on coverage or protection. Built on a full hard-shell construction with extended rear coverage, the 4Forty Air delivers 15 strategically placed vents channelled through an internal air matrix for full-head cooling at any pace. MIPS® Evolve rotational impact protection is integrated directly into the Float Fit™ retention system, keeping the helmet slim, light, and close to the head. Available in Matt Black and Matt White — clean, versatile SOLID colourways that pair with any kit or riding style. The GoggleGuide™ visor adjusts to four positions for sun protection and goggle storage, making this a complete all-day, all-terrain trail helmet.
- MIPS® Evolve system integrates the slip plane into the Float Fit™ retention system to help reduce rotational forces in certain impacts
- Full hard-shell Fusion In-Mold Polycarbonate construction with extended rear coverage for additional protection on technical terrain
- 15 total vents with internal air channelling for consistent full-head airflow in all conditions
- Float Fit™ retention system — a lightweight, easy-to-turn dial for precise one-handed adjustments with MIPS integrated
- GoggleGuide™ 4-position adjustable visor for sun protection and convenient goggle storage
- Sweat Guide™ pad design pulls moisture away from the brow and away from eyewear
- Ionic+™ antimicrobial padding uses silver yarn for long-lasting odour control
- No-Twist Tri-Glides™ keep straps flat and properly positioned throughout the ride
- Certifications: CE EN 1078, US CPSC, NTA 8776 (e-bike), AS/NZ 2063