Troy Lee Designs D4 Mips Stealth Carbon Downhill Helmet - Black - Medium

Mips C2 is a low-friction layer inside the helmet designed to allow 10-15mm of omni-directional movement, reducing rotational motion to the brain during impact.

The helmet should be replaced immediately after any significant impact or if the shell shows signs of structural damage, typically every 3 to 5 years depending on usage.

Yes, the comfort liner is removable and should be hand-washed with mild soap and air-dried to maintain freshness.

While it can be worn for XC, it is purpose-built for downhill and enduro. It may be too heavy or warm for long-distance cross-country efforts.

Measure the circumference of your head just above your eyebrows and consult the specific size chart for the D4 model, noting that the three shell sizes cater to different anatomical fits.

Verify that you are using the correct shell size and ensure the internal padding is securely snapped into the EPS liner.

Adjust the strap tension of your goggles or try a different frame profile, as some oversized goggles may interfere with the eye port.