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The Terra System is a combination of the Terra Cord™ Retainer & added the Plug 'n Play re-attachable end technology of the ARC System™. Terra System™ Adjustable cinches tightly to your headwith the slider bead for a secure fit. XL/XXL End fits the tips of standard & large frame glasses. Tite End/XL Tite End fit on the arms of standard & large frame glasses.
