The stylish, lightweight design of 3M SecureFit protective eyewear 600 Series replacement foam Gasket features proprietary 3M pressure diffusion temple technology. designed to defuse pressure over the ears, the glasses automatically adjust to the wearer, enhancing frame comfort without compromising a secure fit. The foam Gasket for 3M SecureFit protective eyewear 600 Series . Foam Gasket helps keep debris out of the eyes while providing additional cushioning on industrial safety eyewear.