Soft nose bridge for individual fit and comfort 3M’s patented SecureFit™ PDT technology regulates the amount of force on individual head sizes to ensure the optimum pressure for a secure and comfortable fit 3M ID Product ID Description 7100114612 SF415AF SF415AF-EU, PC, clear, +1.5 AS/AF, Frame: black/green Lens PC, Clear 20 p/box 7100114948 SF420AF SF420AF-EU, PC, clear, +2.0 AS/AF, Frame: black/green PC, Clear 20 7100114613 SF425AF SF425AF-EU, PC, clear, +2.