GGS WL320SE Bullhead Safety Winter Liners Black, Shoulder Length, Self Extinguishing, Hinged Thermal Balaclava Quantity:Case of 72 and rated to 12 cal Performance ratings comply with and rated to 12 cal Humidity 15% to 90% non condensing RH Event logging Most recent 30 events Ingress protection IP66 and IP67 Tests Self test on activation and every 20hrs: continuous automatic battery integrity tests Operational life 2 years > 2900 alarm minutes* Shelf life 6 month shelf life prior to activation the material will self extinguish within a given time frame The mouth and nose panel features breathable fleece and mesh which is designed to help prevent eyewear from fogging and allow increased airflow