Both are neoprene suits, but they solve different problems. A swimming wetsuit supports an efficient surface stroke, improves body position, and lets a thin layer of water in so your body can warm it. A diving wetsuit resists abrasion at depth, handles pressure, and works with a separate buoyancy system. The differences show up in the neoprene, the fit, the warranty, and the way the suit behaves in the water.
Surface swimming vs. depth
A swimming wetsuit is cut for horizontal movement. The shoulders must rotate freely through thousands of freestyle strokes, and the suit should lift the hips and legs so you ride higher in the water. A diving wetsuit is cut for vertical movement and prolonged submersion. Thicker panels, heavier zippers, and abrasion-resistant faces matter more than shoulder turnover.
blueseventy builds for surface swimming only. The line is swim-specific, from the Helix race suit to the Sprint entry-level suit.
Neoprene: flexibility vs. thickness
Diving suits use thicker neoprene panels because water pressure compresses neoprene at depth. That extra material helps in a dive profile, but it resists the reach and catch of a freestyle stroke.
Swimming wetsuits use thinner, more flexible panels in the arms and shoulders. blueseventy wetsuits use Yamamoto neoprene in 38, 39, and 40 cell. The higher the cell number, the more flexible the material. The Helix, for example, uses thin, flexible neoprene in the arms and shoulders, plus a permeable catch panel that preserves feel for the water.
Buoyancy: body position vs. pressure management
In swimming, a wetsuit helps raise the hips and legs, which reduces drag. Buoyancy equals speed in the water. LIFT buoyancy panels in the Helix target that support.
A diving wetsuit changes buoyancy as it compresses with depth. Divers manage that change with weights and air. A blueseventy wetsuit provides buoyancy, but it is not a Coast Guard-certified personal flotation device. Treat it as a swim aid, not a safety device.
Fit and water entry
A swimming wetsuit should feel snug on dry land and more comfortable once water enters and warms. The thin water layer is part of the insulation system. The suit is not waterproof and does not keep you dry.
Put on a blueseventy suit with the pads of your fingers, not fingernails. Fingernail punctures are the most common damage and are not covered under warranty. Work the neoprene up in stages and check that the shoulders are seated before you judge the fit.
Thermal protection
Diving suits are built for longer exposure at depth, so thermal protection is a central design goal. Swimming wetsuits provide added thermal protection, but warmth depends on water temperature, exposure time, and the individual.
Below about 56 to 58°F, a purpose-built thermal suit such as the blueseventy Thermal Reaction, fully lined with Zirconium jersey, is designed for cold-water swimming. Above about 70 to 72°F, a full suit can feel too warm over longer swims. That is where a sleeveless suit like the Reaction Sleeveless or a swimskin becomes a better choice.
Durability and care
Diving suits are built for heavy contact. Swimming wetsuits, especially race suits, use thinner neoprene that rewards careful handling. The Helix is the blueseventy race-day suit. Its thin neoprene can break down more quickly with frequent training use, so blueseventy recommends the Reaction or Fusion for swimmers who train once a week or more.
Rinse your suit in fresh water after ocean or chlorine swims. Dry it inside out first, then turn it right side out. Keep it away from direct heat and sharp fingernails.
Can I wear a diving wetsuit for open water swimming?
You can physically wear one, but it will fight your stroke. Thick shoulder panels and heavy zippers restrict rotation, and the extra insulation can overheat you in water where a swim suit is comfortable. For a short social swim, it can work. For training or racing, use a swim-specific suit.
Can I use a blueseventy swimming wetsuit for diving?
No. Swimming wetsuits are not built for the compression, abrasion, and zipper loads of diving. Diving in a blueseventy suit can damage it and voids the warranty. The warranty covers manufacturing and material defects for one year for the original owner, with technical race swimwear at six weeks. Diving, surfing, scuba, kayaking, and other non-swimming use void it.
Which blueseventy wetsuit matches your swimming?
Start with the type of swimming you actually do.
- First open-water race or entry point: Sprint.
- Frequent training, shorter swims: Fusion. The 2021 redesign has a lower-sitting neckline.
- Frequent training, longer swims: Reaction. Higher-grade neoprene than Fusion, built for frequent use.
- Race-day performance: Helix. Thin, flexible arms and shoulders, LIFT buoyancy panels, and a catch panel.
- Cold water below about 56 to 58°F: Thermal Reaction with Zirconium jersey lining.
- Warm water above about 70 to 72°F or easier fit: Reaction Sleeveless.
Quick checklist
- Surface swimming and triathlon: choose a swimming wetsuit.
- Depth and submersion: choose a diving wetsuit, not a blueseventy suit.
- Use the size chart and fit guide before buying.
- Assume the suit is additional buoyancy, not a personal flotation device.
- Rinse and dry after every swim.
- Take a test swim. blueseventy lets you swim in a suit and still return or exchange it if it is clean, dry, unmodified, and has tags and accessories.
If you are buying a swimming wetsuit, the test swim matters more than any spec sheet. Find your size, take the suit to the water, and feel how your shoulders move. All for the swim.
