Putting on the Volas Vitality™ MagicPro 2.0 follows the open U in the photos. There is no listed zipper or clasp.
Hold the padded contacts toward your neck, bring the open side forward, and lower the curve onto your shoulders. Check both sides before you use the buttons. To remove it, lift the U upward and forward.
No size option is listed. If it will not rest evenly, this product may not match your neck shape.
Return to the Volas Vitality MagicPro 2.0 page for the photos.