USM 3315 Mesh Double Sleeve T Shirt Core Product easy insertion and maximum all day FRCA WCA M easy insertion and maximum all day comfort Size and shape fits most ear canals Smooth closed cell outer layer that prevents debris build up Soft and comfortable PowerSoft™ foam supports long term comfort Metal detectable (blue) recommended for use in the food industry NRR 33 protection Stay comfortable and protected with the RJ40 safety jacket A great option for protecting both arms against cuts and punctures in a single piece of PPE The USM 3315 T shirt extends 12" across the breast bone in front and the shoulder blades in back