Apeks ThermiQ Wetsuits — Stay Warmer, Dive Longer
The Apeks ThermiQ wetsuit range takes a fundamentally different approach to thermal protection. Rather than simply adding thickness, Apeks engineered the ThermiQ around graphene — a superconducting material that actively transfers heat from warmer parts of the body (underarms, torso core) to colder areas like the chest and extremities. The result is more even body temperature distribution across the entire suit, not just where the neoprene is thickest. In testing, the graphene fleece lining increases body temperature by an average of 2°C compared to standard neoprene — which translates directly to longer, more comfortable bottom times.
Every ThermiQ wetsuit is also built with a genuine commitment to sustainable manufacturing. The neoprene is limestone-based — made from calcium carbonate rather than petroleum — which significantly reduces CO₂ emissions and environmental impact during production. Lamination fabrics are made from recycled plastic bottles, bonding adhesives are water-based (Aqua-A), and the yarn is dope-dyed to reduce water pollution. The suits arrive in biodegradable packaging.
At DiveCatalog.com, we carry the full ThermiQ lineup for men and women: the 5mm suit for temperate conditions, the 8/7mm ADV for serious cold-water diving, and the 4/3mm hooded vest for layering or warmer water use. The ThermiQ Carbon Core base layers are also available for divers using the ThermiQ system under a drysuit or for added warmth under any wetsuit.
ThermiQ Wetsuit Models
ThermiQ 5mm — Men's & Women's
The 5mm is Apeks' all-round temperate water suit, appropriate for water temperatures roughly in the 15–22°C (59–72°F) range. What sets it apart from a standard 5mm wetsuit is the graphene fleece lining across all panels — heat moves from your warmer core to colder areas passively, without a power source. The suit uses four-way super-stretch limestone neoprene for freedom of movement, double-stitched and liquid-sealed seams to minimise water ingress, and internal wrist and ankle seals to reduce flushing. A non-slip abrasion-resistant shoulder panel keeps your BCD in place and reduces wear. Available in an extensive range of sizes for both men and women, including short and tall cuts.
ThermiQ ADV 8/7mm — Men's & Women's
The ADV is Apeks' premium cold-water suit, built for serious diving in genuinely cold conditions. The 8mm neoprene is positioned on the torso core for maximum thermal protection where it matters most; the arms and legs use 7mm material for improved flexibility. The graphene lining is present throughout, and the ADV adds a built-in hood with a 3D silicone mask grip that holds your mask in place, plus a semi-dry chest zip with an internal water dam to minimise water entry. Large cargo pockets with internal bungee loops keep accessories accessible and streamlined. Liquid-sealed seams and internal cuffs on the forearms and lower leg further reduce water flushing.
ThermiQ Hooded Vest 4/3mm — Men's & Women's
The ThermiQ hooded vest serves two purposes: as a standalone suit for warmer tropical conditions, or as a thermal layering piece worn under the 5mm or 8/7mm suit in particularly cold water. Like the full suits, it uses the graphene lining technology and limestone-based neoprene. Available for both men and women.
ThermiQ Carbon Core Base Layers
The Carbon Core tops are thermal base layer garments designed for use under a drysuit, or to add a layer of warmth under any wetsuit. Available in short sleeve and long sleeve versions for both men and women. The Carbon Core is part of the broader ThermiQ thermal system.
Who Are Apeks Wetsuits For?
| Water Temperature |
Recommended ThermiQ |
Notes |
| 22°C+ / 72°F+ (warm tropical) |
ThermiQ Hooded Vest 4/3mm |
Standalone suit or UV/jellyfish protection |
| 15–22°C / 59–72°F (temperate) |
ThermiQ 5mm |
Graphene lining gives a warmth advantage over standard 5mm |
| 10–15°C / 50–59°F (cold) |
ThermiQ 5mm + Hooded Vest layered |
Double-layer approach extends range of the 5mm suit |
| Below 10°C / 50°F (very cold) |
ThermiQ ADV 8/7mm |
Built-in hood, chest zip water dam, maximum thermal insulation |
Key Technology — What Makes ThermiQ Different
The graphene fleece lining is the defining feature of the ThermiQ range. Graphene is a single atom-thick layer of carbon atoms arranged in a hexagonal lattice — it conducts heat more efficiently than any other known material. Applied as a fleece lining inside the wetsuit, it equalises skin temperature by drawing heat from warmer areas of the body and redistributing it across cooler areas, without any electronics or power source. This is meaningfully different from a standard neoprene suit that simply traps a layer of warm water. The graphene system actively manages heat distribution throughout the dive.
The limestone neoprene base is the environmental complement to this technology. Traditional neoprene is derived from petroleum. Apeks' eco-neoprene uses calcium carbonate from limestone to produce chloroprene rubber, which significantly reduces energy consumption and CO₂ emissions during manufacturing. The lamination fabric is made from recycled plastic bottles, and carbon black — another key neoprene ingredient — is derived from scrap rubber tyres.
Why Buy Apeks Wetsuits from DiveCatalog.com?
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Authorized Apeks dealer — full manufacturer warranty on all wetsuits
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Expert sizing advice — ThermiQ suits are cut for a close fit; our team can help you size correctly
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Men's and women's cuts available — purpose-cut for different body shapes, not unisex
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Fast shipping — in-stock items ship within one business day
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Easy returns — straightforward return process if sizing isn't right
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Rewards program — earn points toward future gear
Frequently Asked Questions — Apeks Wetsuits
How much warmer is the ThermiQ compared to a standard wetsuit?
Apeks' testing shows an average body temperature increase of 2°C compared to a wetsuit without the graphene lining. The practical effect is extended bottom times and greater comfort — particularly noticeable on longer dives and repeat dives where core temperature tends to drop progressively.
What water temperature is the ThermiQ 5mm suited for?
The 5mm is most comfortable in water between approximately 15–22°C (59–72°F). The graphene lining extends the effective temperature range of a 5mm suit, making it viable in conditions where a standard 5mm might feel cold. Layering with the hooded vest extends the lower range further.
Is the ThermiQ ADV 8/7mm suitable for ice diving?
The ADV is designed for very cold water, including near-freezing conditions. For true ice diving, drysuit diving is generally recommended. The 8/7mm ADV is appropriate for cold-water diving in the 5–12°C range, and can be paired with a Carbon Core base layer for additional thermal protection.
What is limestone neoprene?
Traditional neoprene is made from petroleum derivatives. Apeks' eco-neoprene uses calcium carbonate extracted from limestone to produce chloroprene rubber chips — a process that uses less energy and produces less CO₂. The finished neoprene performs comparably to petroleum-based alternatives while carrying a lower environmental footprint.
How should I size a ThermiQ wetsuit?
ThermiQ suits are cut for a close, performance fit — loose areas allow water to flush freely and reduce thermal effectiveness. Apeks provides detailed sizing charts covering chest, waist, hip, height, and weight. We recommend sizing to the smaller end of the range if between sizes, and contact our team if you're unsure.
Can I use the ThermiQ hooded vest under the 5mm suit?
Yes — layering the hooded vest under the 5mm suit is an effective way to extend the thermal range of your setup. The 4/3mm vest adds meaningful warmth, particularly around the core and head, without significantly restricting movement.
Are the Carbon Core base layers for wetsuit or drysuit use?
Both. The Carbon Core tops are designed as thermal base layers for drysuit diving, but they also add useful warmth worn under a wetsuit in cold conditions. They are part of the broader ThermiQ system and use the same sustainable material philosophy as the wetsuits.
The ThermiQ range is one of the most technically advanced and environmentally considered wetsuit lines available. Browse the full collection above, and reach out if you'd like help choosing the right suit or getting sizing right for your body and diving conditions.
