Petzl Non-Absorbent Foam One Size. It does not absorb water or perspiration and is quick and easy to clean. It is compatible with all Petzl helmets. Specifications for Petzl Non-Absorbent Foam: Manufacturer: Petzl Weight: 10 g Fabric/Material: Polyethylene Features of Petzl Non-Absorbent Foam Closed-cell foam does not absorb water or perspiration Quick and easy to clean Compatible with all Petzl helmets Package Contents: Petzl Non-Absorbent Foam Petzl A042MB01: Non-Absorbent Foam One Size