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Typical MTB helmet accessories include replacement liner/pad kits to refresh comfort and hygiene, visors and visor bolts, fit/retention system parts, and—for full-face MTB helmets—cheek pads or mouthpiece components. These parts help restore original fit, manage sweat, and replace worn or damaged external pieces without changing the helmet’s protective design. ([giro.com](https://www.giro.com/cycling/accessories/replacements/))
Most helmet accessories are model-specific. Replacement pad kits, visors, and fit systems are designed around a helmet’s shell shape and attachment points, so you should select the accessory that matches your helmet model (and size, where applicable). While generic foam pad sets exist, OEM parts ensure proper fit and secure installation. ([giro.com](https://www.giro.com/cycling/accessories/replacements/))
Remove the pads/liners and hand-wash with mild soap in lukewarm water, then air dry completely. Clean the shell and visor with mild soap and water only; avoid solvents, harsh chemicals, high heat, or dishwashers, which can damage materials and adhesives. ([helmets.org](https://helmets.org/clean.htm))
Helmets are certified as complete systems (e.g., CPSC 16 CFR Part 1203 in the U.S.; EN 1078 in the EU; downhill/full‑face MTB helmets may additionally be tested to ASTM F1952). Using non‑approved modifications, drilling holes, or adding rigid projections can affect performance; if you mount cameras or lights, follow manufacturer guidance and use breakaway/low‑profile solutions. ([ecfr.gov](https://www.ecfr.gov/current/title-16/chapter-II/subchapter-B/part-1203))
| Standard | Region/Use | Notes |
|---|---|---|
| CPSC 16 CFR 1203 | U.S. bicycle | Mandatory for bike helmets sold in the U.S. |
| EN 1078 | EU/UK bicycle | Common European bicycle helmet standard. |
| ASTM F1952 | Downhill MTB | Higher impact thresholds; tests chin bars when present. |
Replace pads/liners when they’re compressed, worn, or retain odor to restore comfort and fit. However, if your helmet has been in a crash or shows foam cracks or other structural damage, replace the entire helmet—accessories cannot restore impact protection. For a new lid, see our MTB helmets. ([helmets.org](https://helmets.org/replace.htm))