Two decades ago, a triathlete’s biggest anchor on the swim leg was often the thing supposed to help: the wetsuit. Most suits came from surfing. They trapped heat well. They also trapped shoulders, pulled the body into strange angles, and made every catch feel like you were dragging a towel through the water. The solution wasn’t a thinner version of the same design. It was starting over, specifically for the forward, repetitive motion of swimming. blueseventy opened its doors in 1993 to do exactly that.
The Shoulder Problem Surf Suits Ignored
Surf neoprene molds you into a board-paddling posture, chest lifted, arms in front. Freestyle asks for exactly the opposite: long axis rotation, overhead reach, and a clean pull. A suit that resists that motion will fatigue your shoulders before you hit the first buoy. blueseventy addresses this with Yamamoto neoprene graded in three cell structures: 38, 39, and 40 cell. Higher cell counts create a more open foam, which means more pliability. In the Helix, the most flexible grades sit in the arms and shoulders, the places where restriction costs the most energy. The result is a suit that moves with your stroke, not against it.
A side effect of that design choice is worth knowing. The thin, flexible arm neoprene won’t survive hundreds of training sessions unscathed. The brand itself tells buyers the Helix “will break down more quickly” with frequent, abrasive use. That’s a deliberate trade-off: race-day precision versus training durability. For swimmers who hit the lake twice a week, a Reaction or Fusion holds up better over time. Save the Helix for the events that count.
Buoyancy Placed Where It Actually Helps
An evenly distributed buoyancy profile, the kind you get from a general-purpose suit, lifts the whole body like a cork. That feels stable, but it disrupts a horizontal swimming line. The chest rides high, the hips sink, and each stroke wastes effort correcting the angle. In 2018, blueseventy added LIFT panels to the Helix, using NBR foam concentrated around the core and hips. The idea is not to float you higher. It’s to level your spine so your legs catch the surface without bobbing the shoulders out of the water.
On top of that, the Helix includes a permeable catch panel, a design detail that has been in the suit since 2010. Water pressure reaches your forearm through the panel, preserving the feel of holding onto the water during the pull phase. You stay insulated from cold but still connected to each stroke. That tactile feedback never mattered to a surf suit because the original sport never asked for it.
Warmth Without Arm Fatigue
Surf suits fight cold by adding thickness. Thicker neoprene holds more heat, but it also fights shoulder rotation. When the water drops below about 56-58°F, a standard suit can leave you shivering while your stroke falls apart. The Thermal Reaction takes a different path. It lines the entire suit with a Zirconium jersey, the brand’s synthetic wool lining that traps body heat, while the exterior stays flexible enough for a full stroke cycle. The design aims for thermal retention in the core without sacrificing mobility where it’s needed most. For anyone pushing their season into late fall or early spring, that balance can add weeks of viable training.
A Fit That Works for Women, Not Against Them
Unisex wetsuit patterns ignore the differences in torso length, hip circumference, and bust shaping that matter in a swimming motion. A woman buying a small men’s suit ends up with a cut that pulls across the chest and rides too high at the neck. In 2014, blueseventy introduced Femme Fit with an altered pattern in the bust, torso, wrists, and ankles, a lower neckline to cut down on chafing, and a longer zipper for easier entry and faster transitions. That year the line grew to 15 women’s sizing options. Today, the same pattern philosophy lives in every women’s wetsuit across the line.
Fit on dry land feels uncomfortably snug. In the water, neoprene relaxes and the suit becomes part of your body line. The brand’s Test Swim policy is built around that fact: you can swim in the suit, see how it performs, and return it clean and dry within 30 days for a refund. No guesswork. Use the sizing widget, try it, and if it’s wrong, exchange it.
The Race That Cemented the Idea
Alistair Brownlee’s Olympic triathlon gold at London 2012 marked the first time a Helix was first out of the water in both the men’s and women’s races. That wasn’t a marketing moment; it was a field test at the highest level. A suit built purely for swimming proved the concept when it mattered most, and the brand’s design philosophy stuck. Every blueseventy suit since, from the $325 Sprint to the $995 Helix, answers the same question: how do you make a body more efficient moving forward through open water?
Picking the Right Suit for Your Miles
The decision comes down to how often you swim and what temperature you’ll face. Here’s a practical breakdown:
- Race day only: Helix ($995). Maximum shoulder freedom, catch panel sensitive enough to hold water, and buoyancy tuned for speed. The trade-off: it’s built for flat-out speed, not daily abuse.
- Frequent training, longer swims: Reaction ($680). Higher-grade neoprene with more durability for regular open water miles.
- Frequent training, shorter swims: Fusion ($420). A redesigned lower neckline (2021) sits comfortably without breaking the seal, and the neoprene stands up to repeated use.
- First suit, tighter budget: Sprint ($325). An entry-level suit that still gets swim-specific patterning and Yamamoto neoprene.
- Warm water (above 70-72°F): Sleeveless or a swimskin. Full coverage can overheat and restrict on longer efforts in warmer conditions.
- Cold water (below 56-58°F): Thermal Reaction ($785). The Zirconium lining adds meaningful warmth that thin neoprene alone can’t provide.
Every seam, zipper, and foam panel in a blueseventy wetsuit is a response to forward motion, not to standing on a board. The difference shows up the moment you rotate your shoulders and reach for the water. Grab your size from the size chart, read the fit guide, and take a suit for a swim before you commit. You won’t void the return. You will learn in five minutes whether the suit moves with you or against you.
