The zipper is one of the first things you notice on a swim wetsuit, but it does more than open and close. It shapes how you get in, how tightly the neck seals, how much shoulder reach you have, and how fast you can strip the suit in transition. Because blueseventy builds swim-specific wetsuits, zipper placement is part of the stroke pattern, not an afterthought. The three main styles each solve a different problem.
Back zip: easiest entry, familiar feel
A back zip runs down the spine from the neck to the mid-back. For most swimmers, this is the easiest entry style. You step in, pull the suit over your hips, and close the zip with the long cord behind you. The cord lets you zip the suit without help, which matters when you are getting ready alone at a lake or in transition before a race.
The trade-off is in the back panel. Because the zipper and its seam track down the spine, the suit has to work around that seam where the shoulder and upper back flex. A well-fitted back-zip suit still allows a normal freestyle reach, but a loose neck or a too-big torso can let water slip down the back. The key is a snug collar and a zipper that lies flat against the spine rather than bunching.
Chest zip: shoulder freedom and a closer neck seal
A chest zip opens across the upper chest or diagonally from one shoulder. Entry takes a few more steps. You step into the suit, pull it up to the waist or hips, then feed one arm and your head through the neck opening before closing the zipper. That sequence can feel awkward the first two or three times, so practice it before race morning.
Once closed, the chest zip moves the closure away from the back. The shoulder panel can then sit more continuously across the upper back, which is the area a swimmer uses most in the catch and recovery. The neck also tends to sit lower and closer, so less water moves through the collar. That shoulder freedom and reduced water exchange are the main reasons many swim-specific suits use a chest zip.
The cost is entry complexity and zipper care. You have to close the zip without pinching the lining or your skin, and you have to learn where the pull tab sits when you start T1. A rushed chest zip can bunch or catch, so rehearsed movement matters more than zip style.
Zip-free: less to manage, for warmer water
A zip-free suit skips the closure altogether. You step in or pull the suit over the hips and let the neck opening settle into place. The benefit is full upper-body freedom. There is no zipper pull to press into your chest or back, and no closure to misalign when you are cold or tired.
The limit is water exchange. A zip-free neck is usually more open than a zippered collar, so some water can move in and out. That trade-off is fine in warm water and shorter swims. It is less appealing in cold water or over long distances where you want a closer seal and more thermal protection. In a race, a zip-free suit removes one step: there is no pull to find and no zipper to jam.
How to choose for your swim
Your swim style and comfort level point you toward one closure type.
- Choose a back zip if you are new, want solo entry, or want the simplest on and off.
- Choose a chest zip if you want shoulder mobility and a closer neck seal, and are willing to practice the entry.
- Choose a zip-free suit if you swim in warm water, want the least restriction, or want one fewer thing to manage in transition.
Fit still outranks zipper type. A suit that is too large will let water through any closure. A suit that is too small will strain every zipper. Blueseventy wetsuits are designed to fit snug on dry land and feel more comfortable once you are horizontal in the water. The shoulder area is the place to check first: raise your arm overhead as you would in a catch and see whether the suit pinches or pulls.
Zipper style is only one variable. The others are neoprene grade and panel layout. Blueseventy uses Yamamoto 38, 39, and 40 cell neoprene, and the higher cell count means more flex.
On women's suits, the Femme Fit pattern changes the closure experience too. Blueseventy extends the zipper length and lowers the neckline, which helps the suit clear the hips and sit more comfortably around the bust and neck. Those adjustments matter as much as whether the zipper starts at the back or the chest.
Zipper care still counts
Whichever style you choose, treat the zipper as a wear part. Rinse it after salt or chlorine swims. If the zip resists, do not force it. Realign the neoprene and pull in a straight line. The blueseventy warranty covers manufacturing defects for one year, but zipper damage from force is not a warranty issue.
If you are not sure which entry style fits your stroke, take the suit for a Test Swim. You can swim in a blueseventy wetsuit and still return or exchange it within 30 days from the ship date, as long as it comes back clean, dry, and unmodified. That gives you real water feel before you commit.
Happy swimming.
