To install the foam gasket insert, first look for the slots in the corners of the frames. Take the gasket, match the tab with the slot, snap it in. Listen for a click. Press firmly around the gasket to secure, and you're done.
Skullerz Foam Gasket is available for several Skullerz Safety Glasses models, including: Odin, Valkyrie, Kvasir, Baldr and Erda.