By Kai Lani | WAHA Surf Shop
Why Wetsuits Matter
A properly fitting wetsuit extends your surf sessions by keeping you warm and comfortable in cold water. Without one, most surfers can only handle about 20 minutes in water below 65 degrees before the cold starts affecting their paddling strength and decision-making. With the right suit, you can stay out for two or three hours in the same conditions. The technology in modern wetsuits has come a long way from the stiff, heavy suits of the past. Today's neoprene is lighter, stretchier, and warmer than anything available even five years ago.
How Wetsuits Work
A wetsuit works by trapping a thin layer of water between the neoprene and your skin. Your body heats that water, and the neoprene insulates it, keeping you warm. This is why fit matters so much. A suit that's too loose lets cold water flush in and out constantly, which means your body is always heating fresh cold water instead of maintaining a warm layer. A suit that's too tight restricts blood flow and movement, which makes paddling harder and can actually make you colder in your extremities. For more on choosing between wetsuits and lighter options, check out our wetsuit vs rash guard comparison.
Wetsuit Thickness
Thickness is measured in millimeters, written as two numbers separated by a slash. The first number is the torso thickness, and the second is the arms and legs. The torso is always thicker because that's where your core needs the most insulation. Your arms and legs get thinner neoprene to allow for easier movement during paddling and popping up.
- 2mm: Tropical waters 72 degrees F and up (22 degrees C and up)
- 3/2mm: Warm water 64 to 72 degrees F (18 to 22 degrees C)
- 4/3mm: Cool water 56 to 64 degrees F (13 to 18 degrees C)
- 5/4mm: Cold water 48 to 56 degrees F (9 to 13 degrees C)
- 6/5mm: Very cold water below 48 degrees F (9 degrees C)
If you're between sizes or temperatures, go thicker rather than thinner. You can always open a chest zip to cool down, but you can't add insulation mid-session. Most surfers in temperate climates own two suits: a 3/2 for summer and a 4/3 or 5/4 for winter.
Wetsuit Styles
Full Suit (Steamer)
Full coverage with long arms and legs. This is the most versatile option and the one most surfers reach for in cool to cold water. Modern full suits are remarkably flexible despite the coverage. Premium suits use different neoprene densities in different panels, putting stretch where you need mobility and insulation where you need warmth.
Spring Suit (Shorty)
Short arms and legs for warm conditions. These are great for those in-between days when the water is cool enough that boardshorts feel chilly but warm enough that a full suit would be overkill. Spring suits typically come in 2mm or 2/1mm thickness. They're popular for summer surfing and also work well for stand up paddling on breezy days.
Long John and Long Jane
No sleeves with full leg coverage. This style is popular in moderate temperatures and gives you complete shoulder freedom for paddling. The trade-off is less warmth on your arms and torso. Some surfers layer a long john with a neoprene jacket for adjustable warmth.
Vest and Jacket
Core warmth without leg coverage. These work as standalone pieces in warm water or as layering options under a thinner full suit when conditions are colder than expected. A 1mm neoprene vest under a 3/2 suit effectively turns it into a 4/3 without the stiffness of thicker neoprene.
Entry Systems
Back Zip
The traditional design with a long zipper running down the spine. Back zips are the easiest to get in and out of, which is why beginners often prefer them. The downside is that the zipper panel on your back is less flexible than the surrounding neoprene, and it can allow some water flushing when you duck dive or wipe out.
Chest Zip
A shorter zipper across the chest creates a better seal against water entry. The back panel is one continuous piece of neoprene, which means more flexibility through your shoulders. Most intermediate to advanced surfers prefer chest zip suits. They take a bit more effort to get into, but the performance gains are worth it.
Zip-Free
No zipper at all. You climb in through the neck opening. These suits offer maximum flexibility and the best seal against water entry since there's no zipper to create a weak point. The trade-off is that getting in and out takes practice. On cold mornings in a parking lot, the struggle is real. But once you're in, zip-free suits move like a second skin.
Getting the Right Fit
Fit is everything. An expensive suit that doesn't fit right will perform worse than a budget suit that fits perfectly. When trying on a wetsuit, move through a full range of motion. Reach your arms overhead, simulate a paddle stroke, crouch down like you're popping up. The suit should feel snug everywhere with no air pockets or bunching, especially around the lower back and armpits.
- Snug but not restrictive across the chest and shoulders
- No air pockets or bunching at the lower back
- Full range of arm movement without pulling at the neck
- Comfortable neck seal that doesn't chafe
- Try before you buy when possible
Every brand fits differently. O'Neill tends to run a bit narrower through the chest. Rip Curl suits are known for generous arm length. Patagonia suits fit well on athletic builds. If you're buying online, check the brand's size chart carefully and read user reviews about fit. According to wetsuit engineering principles, even small gaps in fit can reduce thermal protection significantly.
Wetsuit Care
A well-maintained wetsuit lasts two to three seasons of regular use. A neglected one might only make it through one. The number one rule is to rinse your suit with fresh water after every single session. Salt water and sand break down neoprene over time. Dry your suit inside out first, then flip it right-side out to finish drying. Never leave it in direct sunlight for extended periods, and never hang it on a thin wire hanger that can crease the shoulders.
- Rinse with fresh water after each use
- Dry out of direct sunlight, inside out first
- Hang on a wide hanger or fold properly
- Use wetsuit shampoo every few weeks
- Store hanging, not crumpled in a bag
When to Replace Your Wetsuit
Wetsuits don't last forever. The neoprene compresses over time, losing its insulating ability. If you notice that your suit feels colder than it used to, or if it's developing cracks along the fold lines, it's probably time for a new one. Seam separation is another sign. Small holes can be patched with neoprene cement, but once the overall material starts degrading, repairs just buy you a few more sessions. Most surfers who go out two or three times a week can expect about 18 months from a primary suit before it needs replacing.
Frequently Asked Questions
Is a 4/3 wetsuit OK for 10 degree water for an hour?
A 4/3mm wetsuit can work for 10 degree Celsius (50F) water for about an hour, but you will likely feel cold toward the end of your session. For regular surfing in water this cold, a 5/4mm with booties and gloves is more comfortable.
How tight should a wetsuit be?
A wetsuit should fit snugly with no gaps or bunching, especially around the neck, wrists, and ankles. You should be able to move your arms freely for paddling. If water flushes through easily, the suit is too loose.