The SENTINEL vapor barrier is constructed with a monolithic 2 component laminate that is not only highly breathable but is also waterproof and resistant to bloodborne pathogens. Vapor passes through SENTINEL by means of differential heat allowing vapor to pass through what is a solid monolithic construction, while blocking water and bloodborne pathogens. This bilaminate barrier is unique and has been specially developed for fire fighting gloves, to be durable, to offer excellent protection and to increase the dexterity of our gloves. Four layer kevlar-knit wrists.