The Ultimate Wetsuit Guide for Surfers

New to wetsuits, replacing a tired old suit, or just wondering why new rubber feels so light? This guide covers how wetsuits work, what they are made from, how thickness and fit work, and what you get as you spend more, so you can pick a suit that keeps you warm all season.

How do wetsuits keep you warm?

Quick answer: A wetsuit traps a thin layer of water, your body heats it, and the neoprene holds that warmth in.

It sounds backwards, but a wetsuit uses water to keep you warm. Here is how it works:

• Controlled water entry: the suit lets in a thin layer of water, about 0.5 to 1mm, between your skin and the rubber.
• Body heat: your body warms that trapped water within seconds.
• Neoprene insulation: millions of tiny gas bubbles in the neoprene slow heat loss, sealed seams stop cold water flushing through, and the outer surface blocks the wind.
• Thermal linings: many suits add a lining on the inside that holds extra warmth without adding much bulk.

The water stays put, the heat stays with you and the wind stays out, so you can surf for longer.

What are wetsuits made from?

Quick answer: Wetsuits are made from synthetic or natural rubber foams, most often neoprene.

Neoprene was invented at DuPont in 1930 and has been the standard wetsuit material for decades. It is flexible, durable and keeps you warm in cold water.

Neoprene is a closed-cell foam. Picture a microscopic honeycomb with every cell filled with gas. Those trapped bubbles block heat loss and keep a warm layer between your skin and the sea.

Manufacturers can make it in many thicknesses, from 0.7mm up to 7mm, to suit different water temperatures. Thicker neoprene gives more insulation, but it is stiffer, so you give up some flexibility for the extra warmth.

There are three main types of wetsuit rubber:

• Petroleum neoprene: the original surf rubber, made from crude oil. It is warm, stretchy enough and very durable, but it is heavier when wet and has the largest carbon footprint of the three.
• Limestone neoprene: made from calcium carbonate from limestone instead of oil. It has a tighter cell structure, so it feels lighter, absorbs less water and stretches more. Mining and processing still leave a footprint, but a smaller one than petroleum neoprene.
• Yulex: a plant-based rubber made from natural tree latex, developed with Patagonia. It is about as warm as neoprene and a little firmer.

How are wetsuits made?

Quick answer: A wetsuit is built from neoprene panels, the seams that join them and the linings inside.

Panels

Every suit starts as a pattern that follows how surfers move. Thicker panels cover the chest, back and kidneys for warmth, and thinner panels sit at the shoulders, elbows and knees so you can paddle freely.

Fewer, larger panels give more stretch and a lighter feel, but they cannot follow every curve of the body. More panels give a closer fit, but every extra seam is another place water can get in. Good design balances the two.

Seams

Once the panels are cut, they are joined edge to edge to make a watertight seal. The seam type makes a big difference:

• Flatlock stitching: used on entry-level suits. It is cheap and strong, but it lets water in, so it suits warm water only.
• Glued and blind-stitched (GBS): used on mid-range suits. The panels are glued, then stitched only part of the way through the neoprene, so the needle never punches a hole all the way through.
• Taped and welded seams: used on premium suits. Internal tape, liquid rubber or stitch-free welds add durability and warmth, but they add weight and can stiffen the stretchiest areas.

Many brands mix methods, such as flexible GBS seams in the arms and welded seams across the chest, so the suit stays flexible where you paddle and sealed where you need warmth.

Linings

Bare neoprene traps heat reasonably well, but a lining on the inside holds extra warmth, sheds water and feels warmer against your skin.

• Full-body linings: make winter steamers much warmer, but add weight.
• Zoned linings: cover the torso and thighs for warmth and leave the shoulders light for paddling.
• Competition suits: often skip heavy linings to keep as much flex as possible.

How does wetsuit thickness work?

Quick answer: The bigger the numbers, the thicker and warmer the suit. The thickest neoprene covers your core, and thinner neoprene on the arms and legs keeps you flexible.

• What the numbers mean: wetsuits are usually labelled with two numbers, such as 3/2mm. The first is the torso thickness for core warmth (3mm) and the second is the arm and leg thickness for flexibility (2mm). Some winter suits add a third number for the hood or lower legs.
• Where the thick panels go: brands put thicker neoprene over the chest, back and kidneys, and thinner neoprene at the shoulders, elbows and knees.
• Warmth versus flex: each extra millimetre adds warmth, but also weight and stiffness.
• Accessories: boots, gloves and a hood add a lot of warmth without moving up a whole suit thickness.
• Fit matters most: even a thick suit will not keep you warm if it is baggy. A snug 3mm suit often beats a loose 4mm.

What wetsuit thickness do I need?

Quick answer: Choose your suit for the coldest water you will surf, not the air temperature on the beach.

• Water temperature matters most: water draws heat from your body about 25 times faster than air, so the sea temperature matters more than the wind on the beach.
• Plan for the coldest session: use the coldest water you will surf in, usually first thing in the morning, when choosing thickness.

Wetsuit thickness and water temperature chart

For a state-by-state breakdown, see our guide to which wetsuit thickness is best for Australia.

How should a wetsuit fit?

Quick answer: Like a second skin. Snug everywhere, comfortable to breathe in, with no loose or baggy neoprene.

• Snug, not tight: it should take some effort to pull on, but you should still breathe comfortably once it is zipped up.
• Smooth, no wrinkles: no baggy neoprene at the armpits, lower back or behind the knees.
• Sealed openings: the neck, wrists and ankles sit close to the skin so cold water cannot flush in.
• Full range of movement: squat, paddle and swing your arms. You should feel some resistance, but nothing should stop you moving.
• Panels in the right place: the knee pads sit on your knees, the sleeves end at the wrist bone and the legs end at the ankle bone.

For a step-by-step try-on test, read how a wetsuit should fit.

What is the difference between cheap and premium wetsuits?

Quick answer: As the price goes up, so does the quality of the rubber, the seams and the linings. That means more warmth, more flex and more seasons out of the suit.

With wetsuits you generally get what you pay for, but you do not need to spend the most to get good value.

Budget suits ($200 to $300 AUD)

• Rubber: standard petroleum neoprene. Reliable, but heavier and less stretchy.
• Seams: flatlock stitching. Strong, but it lets water in on cold days.
• Warmth and flex: fine for summer, with limited stretch and little or no lining.

Mid-range suits ($300 to $450 AUD)

• Rubber: higher-grade limestone neoprene or stretch blends that feel lighter.
• Seams: glued and blind-stitched, often with taping in key areas, which keeps most water out.
• Extras: linings in the torso, chest zips that resist flushing, and key pockets.
• Warmth and flex: a solid all-rounder that handles winter surf with boots and a hood.

Premium suits ($500+ AUD)

• Rubber: top-grade limestone neoprene such as Yamamoto. Very light, absorbs little water and dries fast.
• Seams: fully taped or liquid-sealed, sometimes stitch-free, for the best seal.
• Linings: full-body thermal linings.
• Warmth and flex: light and flexible from the first surf, with the warmth of a much heavier suit.

How long does a wetsuit last?

Quick answer: Roughly 100 to 250 surfs, depending on the quality of the suit and how well you look after it.

The figures below are rough guides for someone surfing two or three times a week.

Entry-level suits

• Typical life: 1 to 1.5 seasons (around 100 surfs).
• What usually fails: leaking seams and crushed foam.

Mid-range suits

• Typical life: 2 to 2.5 seasons (around 150 to 200 surfs).
• What usually fails: stretched neck and wrist seals.

Premium suits

• Typical life: around 3 seasons (250 surfs or more).
• What usually fails: worn linings and corroded zips.

How to make your wetsuit last longer

• Rinse in fresh water: after every surf. Salt left in the suit wears down the seams.
• Dry it in the shade: with the zip open, folded over at the waist or on a wide hanger, never a wire one.
• Rotate suits: if you surf every day, a day off lets the neoprene recover.
• Fix small tears early: with neoprene cement, before they grow into big ones.
• Keep it out of the heat: a hot car boot or a hot shower breaks down the neoprene faster.

If a tear does appear, our guide to repairing a wetsuit tear at home walks you through it.

How are Flatrock wetsuits designed?

Quick answer: We design for comfort and flexibility first, for water between 14 and 20°C. We avoid unnecessary bulk and stiffness, and we sell direct to you, with no middlemen adding to the price.

• Limestone neoprene: warm, light, stretchy and slow to absorb water.
• Lots of panels: our V2 men's 3/2mm steamer is built from 24 panels, so the suit moves with your body.
• Sealed seams: we glue, blind-stitch and tape our seams to stop water flushing in through the stitching.
• Detachable chest zip: the zip detaches fully and reconnects each time you suit up, which eliminates zipper breakage.
• Lining where it counts: a quick-drying lining across the torso and back keeps you warm without weighing down the rest of the suit.

The Men's 3/2mm Steamer V3 runs the thermal lining down to the knees, strengthens the cuffs, adds a key holder at the chest zip and comes in new short and tall sizes. For warmer days, the Men's 1.5mm Wetsuit Top V2 is limestone neoprene cut from six panels with four-way stretch.