Enclosure is a term used by latex fetishists to describe the condition of being completely covered by latex from head to toe with no skin visible. Many fetishists enjoy the feeling of being totally enclosed in latex - some even in multiple layers of latex. For some it even has meditative qualities, shielding the wearer completely from the outside world, giving a feeling of protection. Total enclosure is a way to achieve sensory deprivation.
Care is necessary when enveloping the head not to restrict breathing too much, although some people find that a slight restriction is an important part of the total sensation.