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.

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. 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

Bio-mapped thermal protection for drysuit diving. 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.

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).

One of the most versatile and popular undersuits on the market today. The Fourth Element Arctic combines performance materials with intelligent design. This complete set includes top, leggings and a bag.

The Arctic leggings feature secure foot loops to keep leggings in place when donning the drysuit. A high waistband ensures that separation of top and leggings is minimised. Tuck the top into the waistband before donning the drysuit. The lower legs are single layered to prevent too much bulk around the ankles making donning easier.

A high density inner fleece provides superior insulation

One of the most versatile and popular undersuits on the market today, Arctic combines performance materials with intelligent design. The Arctic top is designed with a long body portion to ensure adequate overlap between the top and trousers.

A high performance alternative to cotton underwear, these leggings provide enhanced thermal protection and keep the skin drier an more comfortable during the dive. A high waist, wide elasticated waistband and flat seams throughout maximise next to skin comfort.

Designed with a looser fit, this top can be worn on the way to the dive and then worn as part of a layering system, next to the skin. Flat seams make the top very comfortable and the wicking fabric keeps the skin warmer and drier.

A high performance alternative to cotton underwear, these leggings provide enhanced thermal protection and keep the skin drier an more comfortable during the dive. A high waist, wide elasticated waistband and flat seams throughout maximise next to skin comfort

Flatteringly designed. With pillar valve o-rings used in place of buttons, this top has a subtle diving theme, yet looks good and is a great next to skin layer beneath any undersuit. It can be worn on the way to the dive and then worn as part of a layering system, next to the skin.

Cotton holds perspiration and moisture next to the skin where it can feel clammy, cold and uncomfortable. This vest is the perfect alternative to cotton underwear.

A double layer of high insulation materials ensure that these socks provide maximum thermal protection for the feet.

High waisted leggings with flat tape ensures no separation of top and leggings. Unisex fit.

Xerotherm is the most effective next to the skin garment for ensuring warmth and comfort.

Flat seams are used throughout to maximise next to the skin comfort. Thumb loops prevent sleeves from riding up. Unisex design.

Comfortable and warm, it can make all the difference on a long deco stop. Unisex sizing.

The complete set includes top, vest, leggings, socks and a bag. Made using Polartec® Powerstretch® which was originally developed for NASA.

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.

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.

The perfect choice when you require a small amount of extra thermal
protection. The T100 combines many of the same features as our Super
Hi-Loft series with a regular loft Thinsulate™.

This underwear uses compressed Thinsulate™ that offers less bulk, but still extremely effective insulation for everything but the coldest dives.

SP Heated Vest with Halcyon light canister, NiMH battery and e/o cord only. This package does not include Halcyon light head.

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 vest covers the lower back, providing heat to the vital kidney area.

Designed to work safely even if a drysuit flood occurs, the SP Heated Diving Vest draws on a gentle 36w that minimises the risk of burning the diver or aggravating the risk of bends through excessive capillary dilation. Depending on battery and light combination used the 'burn time' can range from 60 to 270 minutes (1 to 4.5 hours).

Includes: Heated Vest, Halcyon NiMH battery, canister, e/o cord and charger.

Also available with optional Halcyon HID and LED light heads with e/o connection.

Silent Planet's innovative Heated Vest has now been paired with battery pack from Light For Me.

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. Designed to work safely even if a drysuit flood occurs, the SP Heated Diving Vest draws on a gentle 36w that minimises the risk of burning the diver or aggravating the risk of bends through excessive capillary dilation.

Includes: Heated Vest, Light For Me NiMH battery, canister, e/o cord and charger.
Also available with optional Light For Me 4TEC light head with e/o connection.

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.