4Forty MIPS MTB Helmet

The Bell 4Forty MIPS MTB Helmet is built for serious trail riders who demand performance, protection, and value. Designed for mountain biking, trail riding, and all-day adventures, this helmet delivers premium features without the premium price tag.

Engineered with MIPS (Multi-Directional Impact Protection System), the 4Forty enhances safety by reducing rotational forces during impacts — ideal for technical trails and aggressive riding. The extended rear coverage offers added protection where it matters most, giving you confidence on every descent.

Stay cool and comfortable with optimised ventilation and Bell’s Float Fit system, providing a secure, adjustable fit for long rides. The integrated Sweat Guide padding helps keep moisture away from your eyes, so you can stay focused on the trail ahead.

A durable full hard-shell construction ensures long-lasting performance, while the adjustable visor accommodates goggles or sunglasses with ease — perfect for changing trail conditions.

• MIPS® EVOLVE — Mips Evolve 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®).
• ADJUSTABLE VISOR — Adjustable visor allows for sun protection and easy goggle storage.
• 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.
• GOGGLE GRIPPER — Rubber grip on the back of the helmet keeps your goggle strap in place.