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Membrane dry suits are made from thin materials, and thus by themselves have little thermal insulation. [link widoczny dla zalogowanych] They are commonly made ofvulcanized rubber, or laminated layers of nylon and butyl rubber. Membrane dry suits typically do not stretch, so they need to be made oversized and baggy to allow flexibility at the joints through the wearer's range of motion. This makes membrane dry suits easy to put on and get off, provides a great range of motion for the wearer, and makes them comfortable to wear for long periods, as the wearer does not have to pull against rubber elasticity.
To stay warm in a membrane suit, the wearer must wear an insulating undersuit, today typically made with polyester or other synthetic fiber batting. Polyester and other synthetics are preferred over natural materials, since synthetic materials have better insulating properties when damp or wet from sweat, seepage,[link widoczny dla zalogowanych] or a leak. (Except for wool, which is an effective insulator when damp, albeit bulky.)
Reasonable care must be taken not to puncture or tear membrane dry suits, because buoyancy and insulation depend completely on the gas pockets in the undersuit (whereas a wetsuit normally allows water to enter, and retains its insulation despite it). The dry suit material offers essentially no buoyancy or insulation itself, so if the dry suit leaks or is torn, water can soak the undersuit, with a corresponding loss of buoyancy and insulation.
In warmer waters, some wearers wear specially designed membrane dry suits without an undersuit. These are different in design, materials, and construction from dry suits made for cold water diving.
Membrane dry suits may also be made of a waterproof and breathable material to enable comfortable wear when out of the water for long periods of time. Sailors and boaters who intend to stay out of the water prefer this type of suit.
Being made of a fairly rigid dense material, foam neoprene dry suits are not as easy to put on and remove as are membrane dry suits. As with wet suits, their buoyancy and thermal protection decreases with depth as the air bubbles in the neoprene are compressed. This happens to a small extent with the dry fabric providing insulation under a dry suit,[link widoczny dla zalogowanych] but can be prevented by inflating a drysuit at depth through an inflator valve,[link widoczny dla zalogowanych], thus preventing "suit squeeze" and crushing of the air-filled dry fabric beneath.