Equipped with hard metal back (stainless steel or aluminum), they are designed for technical divers that enjoy the deep dives with big or double cylinders that need more thrust.

Donut wing type 20 l capacity with 1000 deniers, double polyurethane bladder. Suitable for diving with double tanks.

Donut wing type from tds iron model 16 l capacity and with 1000 denier nylon, double polyurethane bladder. Suitable for single tank diving.