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Two-piece suits of the period include the American-made Spearfisherman frogman suit, U.S. Divers Seal Suit and the So Lo Marx Skooba Totes suit,[link widoczny dla zalogowanych] the Italian-madePirelli suit and the UK-made Heinke Delta suit and Siebe-Heinke Dip suit. These suits were sealed at the waist by rolling together the excess material at the bottom of the shirt and the top of the pants. A cummerbund, rail, or surgical tubing was sometimes provided to make the seal more waterproof. A modern version of the two-piece dry suit is manufactured by Customworks of Idaho. Though lacking such features as valves and zippers, these suits still have certain advantages over their modern counterparts. For example, they are cheaper, less bulky,[link widoczny dla zalogowanych] more easily repaired and the footed pants could also double as fishing waders.
These are typically only seen on professional and commercial diving suits. They allow separate neck seals, gloves, and boots to be joined to the suit with a watertight seal. The attachment ring system uses a support ring inside the suit and a clamping band outside the suit to tightly hold the suit and the separate hood/boot/glove together. They were also used with the neck seals of some old British frogman-type dry suits (see above).
The support ring can optionally be slipped into the sleeve of a regular dry suit that has wrist seals, to temporarily put watertight rubber gloves on the suit, or the wrist seals can be removed and the inner support ring is permanently attached inside the sleeve. The support ring may be a large one-piece unit that can be slipped over the head/hands/feet,[link widoczny dla zalogowanych], or it may be split into halves that can be directly installed up close around the neck/wrists/ankles.
Attachment rings let a commercial diver change his suit to best perform the task at hand. Wrist seals can still be used with an attachment ring suit; they are mounted onto the ring like a pair of gloves.
Normally, the gas used for dry suit inflation for diving is air from the primary breathing cylinder. When divers breathe helium-based gas mixes such as trimix, they often avoid inflating their suits with the helium-based gas due to its high thermal conductivity. They often carry a separate cylinder for this purpose; generally it contains air, although sometimes argon, which has lower thermal conductivity,[link widoczny dla zalogowanych] is used.[11][12] Alternatively, some trimix divers inflate their suits from adecompression cylinder containing a nitrox blend (all such decompression blends, including pure oxyten, have essentially the same thermal conductivity as air).
In surface dry suits, the wearer normally never dives deeply underwater, and is not concerned about neutral buoyancy, so there are no air valves on a surface dry suit.