P3E Helmet attachment for helmet mounting. Helmet not supplied. The 3M™ PELTOR™ Optime™ III is a high performance hearing protector developed for use in extremely noise environments like airports, marine engine rooms, power stations and print works. Double casings technology helps minimise resonance effect. Large space inside cup helps reduce moisture and heat build-up. Soft wide cushions helps reduce pressure around the ears and improves comfort and wearability. Easy to replace cushions and inserts helps keep them hygienically clean.