Every spring I get the same note from swimmers and triathletes: should I buy a spring suit or a shorty? My answer starts with a different question. Which parts of your body need insulation, and which parts need to move freely? A full wetsuit does two jobs for a swimmer. It traps a thin layer of water against your skin for warmth, and it lifts your hips and legs so you sit higher in the water. A shorty and a spring suit trade away some of that coverage in different ways. Understanding the trade-off matters more than the label on the rack.
The labels themselves are not standardized. In most shops, a shorty has short sleeves and short legs. A spring suit usually has full-length arms and short legs, though some stores use the terms differently. Both cuts leave more skin exposed than a full suit. Both use thinner neoprene than a cold-water suit. What matters is which muscles and joints stay covered, and how that changes your position and heat loss once you start swimming.
Coverage Changes How You Swim
Neoprene around your hips and legs does more for body position than neoprene on your arms. It lifts your lower body, which reduces drag and helps you hold a better line through the water. Buoyancy equals speed in open water. Arm coverage contributes less to that lift. Full sleeves mostly add shoulder restriction, unless the neoprene in the arms is thin and flexible enough to move with your catch.
A long-sleeve, short-leg spring suit can feel mismatched for a swimmer. You get the shoulder restriction of a full suit while giving up much of the leg lift that makes a full suit useful. A shorty gives up most of that lower-body lift and most of its insulation. It works as a comfort layer in warm water, not as a performance tool. If the water is warm enough that you do not need full coverage, shoulder freedom and easy entry matter more.
Why Long Sleeves Can Work Against You
Your shoulders move differently when you swim than when you paddle. They rotate through a full range of motion on every stroke, and thick or stiff arm panels resist that motion. Surf cuts are built around paddling with the arms mostly forward. Swim-specific cuts are built around the catch. When you skip full sleeves, you remove a common source of shoulder fatigue and let your stroke stay long.
Water Temperature Is the Real Decider
Blue70's published water temperature guidance gives a practical starting point. Below roughly 56 to 58 degrees Fahrenheit, a purpose-built thermal suit such as the Thermal Reaction adds useful warmth. A shorty or spring suit does not provide enough warmth for that range beyond a quick dip. Above roughly 70 to 72 degrees Fahrenheit, a full suit can feel hot over a longer swim, and a sleeveless or short john cut becomes more practical. Between those bands, a full suit or a sleeveless suit works depending on your event distance, how you handle cold, and how hard you expect to work once you get past the first 400 meters.
Those numbers are starting points, not rules. A swimmer who runs cold may prefer more coverage at 68 degrees. A swimmer doing a fast race in the same water may be fine in less. Choose the cut for your conditions and your body.
Two Warm-Water Cuts from Blue70
Blue70 has built swim-specific wetsuits since 1993 and does not carry a surf-style spring suit. The closest warm-water cuts are the Glide Short John and the Reaction Sleeveless.
The Glide Short John is sleeveless with short legs, priced at $210, and built for warm water and easy fit. It keeps your arms completely free. The Reaction Sleeveless is a long john cut, sleeveless with full legs, at $395, for warmer water when you want more lower-body coverage and lift. Both cuts remove the long-arm problem and keep neoprene where a swimmer wants it most: around the core and hips.
How to Choose by Coverage
Start your decision with four questions.
- Which parts of your body need insulation?
- Which parts need freedom to move?
- How long will you be in the water?
- How much time do you want to spend peeling the suit off in transition?
If the water is above about 70 degrees, you need very little insulation and a lot of shoulder freedom. A short john cut is the natural choice. If the water sits in the 60s, you may want the extra leg coverage of a sleeveless full-leg suit, and that choice often comes down to how long you plan to swim and how hard you will work once the initial chill wears off. Below about 60 degrees, you want a full suit, and a thermal suit starts to earn its price.
Race Day and Transition
Short legs and no sleeves come off faster than a full suit. In a sprint race, transition time is time on the clock. In a cold long-course race, the warmth and lift of a full suit matter more than a few seconds at T1. Match the cut to the entire race day.
Thin Panels Need Careful Hands
Shorty and short john suits use thin panels and more exposed edges than a full suit. That makes them easier to get into and out of, but easier to damage. Fingernail punctures and heel tears are the two most common ways swimmers hurt a wetsuit. A few habits protect the suit:
- Roll the neoprene on instead of digging your fingernails into it.
- Pull from the body of the suit when you take it off, not from the thin edges.
- Rinse in fresh water after every swim.
- Dry out of direct sun and store flat or on a wide hanger.
Blue70's Test Swim policy takes some risk out of the fitting process. You can swim in a wetsuit and still return or exchange it if the suit comes back clean, dry, unmodified, and with tags. That matters when you cannot tell on dry land how your shoulders will feel after 1,000 yards.
If you are deciding between coverage levels, use the Blue70 fit guide and a test swim instead of relying on a shop label. Find your size, try the suit in the water, and keep the one that lets your stroke stay long. Happy swimming.
