3M S657 Versaflo Headtop With Shoulder Coverage White3M S657 Versaflo Headtop With Shoulder Coverage White 3M S657 Versaflo Headtop with Shoulder Coverage Similar to the S 655, the 3M S 657 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. The 3M S 657 Hood offers head,