Certified for track use these Stilo ST5 Replaceable Earmuffs are excellent for the isolation of external car and track noises.
These are not fitted with speakers if you need communications the item you need is the Earmuff Speaker kit (AE0304).
Each ear muff weighs 40 grams.
Available for the whole of the Stilo ST5 range, but will fit in any Stilo helmet.