This invention is directed to an improved process for the preparation of N-glycine, a salt of N-glycine, or an ester of N-glycine. Each support has an upstream side and a downstream side, with the front support including at least one first fluid passage permitting fluid flow from the upstream side to the downstream side, and the rear support including at least one second fluid passage permitting fluid flow from the upstream side to the downstream side. A gap in the outer shell is formed, which gap is adapted to receive at least a portion of the strap of straps of the eye gear of goggles.