Measure according to the product guide, especially the base-ring diameter and usable cage length. A secure fit should not pinch, cut off circulation or allow significant movement.

Metal is rigid and often heavier, while silicone is lighter and more flexible. The better choice depends on anatomy, wear time, cleaning needs and experience.

Begin with short supervised periods and inspect the skin and circulation frequently. Extended wear should only be considered after a comfortable fit is proven and emergency removal is available.

Remove it for numbness, cold skin, discoloration, persistent pain, swelling, broken skin or difficulty urinating. Seek medical help if symptoms do not resolve promptly.