Ursuit and Finnfill technology bring you warmth without the stiffness or bulk.

With watertight thermal insulation that renews its protective property with every dry cleaning and has minimum loss during wash, Ursuit's X-Tex range of Finnfill undersuits are the ideal choice for active divers throughout the world.

X-Tex Finnfill undersuits are exceptionally flexible and watertight,  providing perfect thermal insulation ranging from 0.83 CLO in the 'Light' version to 1.97 CLO for the all-season 'Heavy' style.

Four layer structure:  Each Ursuit Finfill undersuit is manufactured from 4 layers with the special Finnfill fibre as an insulating layer a and breathable watertight X-Tex membrane as the intermediate layer. The surface of these suits are made of elasticated and slippery tricot fabric and the inner lining has the comfort of fleece.

Innovative design! Highest quality materials available combined to provide maximum warmth, mobility and comfort. Click to see DUI Size Chart

Bio-mapped thermal protection for drysuit diving

This is Fourth Elements newest undersuit. Designed to maximise thermal protection and minimise buoyancy, the HALO 3D has body mapped insulation placed strategically to enhance protection whilst in horizontal trim. Sitting between the Arctic and SubX the HALO 3D is the perfect complement to the current range.

200g Warming Vest to be worn underneath the main undersuit. The material used to make this Vest consists of three layers: micropolar, Thinsulate BZ 200 and Pertex as the outer layer.

The Santi Extreme 400 Heated is not just a 'vest' but a full 400gr undersuit with an integrated heating system that beats the chill out of your colder dives or long decompression stops.

Made from Thinsulate™ 400gr this fully breathable undersuit keeps you warm even without the heating and retains warmth for a long time after the heating is switched off. A 10 Ah battery gives you around an hour of constant heating time while this can be doubled to 120 minutes with a 20 Ah power source. All connectable through a male/female plug and out of the way when not using the heating system. (Battery not included).

The Weezle Compact undersuit offers less thermal protection than the Weezle Extreme, suitable for under neoprene or for warmer waters.

Incorporated into the design are 2 hip pockets and an innovative ‘slashed’ cuff which removes the need for thumb loops. On the shoulder is a toughened nylon back panel to protect from rear entry dry zip damage.

Made of high class compressed Thinsulate BZ 200. This insulation absorbs less than 1% of its weight, so even in damp conditions it retains its insulating ability. This breathable material guarantees thermal balance of the diver's body.

Undersuit BZ 400 is the warmest one Santi offers. It is designed for diving in water temperature less than 7 degrees Celsius. It is also ideal for long deep diving, with decompression. Best divers and instructors from GUE helped to develop this Undersuit.

Specifically designed and tailored for ladies with a "convinience zip". The BZ400 is the warmest undersuit Santi offers. It is designed for diving in water temperature less than 7 degrees Celsius. It is also ideal for long deep diving, with decompression.

DUI's most Popular Insulation Jumpsuit! Polartec® Power Stretch® fabrics feature body-hugging 4-way stretch and are very breathable. They keep you dry when you sweat and provide warmth without weight. These are the most versatile outdoor and fitness apparel fabrics available today. Click to see DUI Size Chart

Innovative design! Highest quality materials available combined to provide maximum warmth, mobility and comfort. With feedback from divers around the world, DUI combined Thinsulate Ultra 400 Insulation Type BZ with Polartec® PowerStretch® to provide the warmest and closest fitting undergarment possible. Click to see DUI Size Chart

Highly breathable to providing comfort in all activities. All-way stretch: polyester/lycra blend. Click to see DUI Size Chart

Weezle boots use the same innovative materials as used in Weezle undersuits. Colour: black.

Constructed from 4 layers of specially chosen fibres each chosen to perform differently offering good thermal protection under any type of drysuit. Colour: black

Silent Planet's innovative Heated Vest System has been designed to effectively apply heat during the decompression stage of a dive, utilising the diver's primary light battery or an additional battery canister. The vest is designed to deal with core temperature drop particularly at the ascent phase of a dive where there is a lack of physical activity. Uniquely the SP Heated Vest covers the lower back, providing heat to the vital kidney area. (Vest + Valve only, does not include torch, battery and canister-side connector).