Hood uses a double shroud design for its respiratory seal; wearers can select on their seal design based on personal preference. The wearer should tuck the inner shroud into a shirt or protective coverall, which allows excess air to be channelled over the body for additional comfort. Hood offers head, face, neck and shoulder coverage as well as providing eye and face protection to EN166 - liquid splash and low energy impact (grade F) the same classification for impact resistance as safety spectacles! Manufactured using a general purpose, fabric, and is a cost effective, practical powered air solution. When used in conjunction with 3M Powered and Supplied Air Systems the S-657 offers an assigned protection factor (APF) of: Jupiter APF= 40. Dustmaster APF= 10. TR-300 APF = 40. V-500 APF= 40. Assigned Protection Factor (APF) as detailed in HSE HSG53.