Wetsuit Sizes and How To Measure for One

A wetsuit that fits too loosely lets cold water flush through, while one that fits too tightly can make it hard to paddle, swim, or move comfortably. 

Key Takeaways

• Wetsuit sizes vary by brand, so you shouldn’t pick one based on your regular clothing size.
• A good wetsuit size chart uses height, weight, chest, and waist at a minimum, and some styles also require inseam or torso length.
• Different wetsuit styles, such as full suits, spring suits, and youth suits, each have their own sizing.
• Online stores that sell wetsuits can reduce returns by adding clear, product-specific size charts and measuring instructions to their product pages.

Shopping for wetsuits online is intimidating. You can eyeball whether a hat will work or guess on a hoodie, but a wetsuit has to seal well enough to keep you warm and be flexible enough to actually let you move. That’s a tall order when you can’t try the suit on first. Whether you’re a Shopify store owner selling online sportswear or a customer looking for their first wetsuit, understanding how wetsuit sizes work is the best starting point.

How Wetsuit Sizes Work

Wetsuit sizing follows most of the same general size labels you’d see in clothing: XS, S, M, L, XL, and XXL. However, a wetsuit needs to fit more like a second skin than a piece of activewear. That means small differences in height, chest, waist, and torso length can affect how well the suit seals, stretches, and moves with the body.

Wetsuits are also sold in short, tall, and long versions to account for different heights and torso proportions. That means two customers who both wear a medium in everyday clothing may actually need different wetsuit sizes.

How To Measure for a Wetsuit

Learning how to measure wetsuit size is straightforward. You’ll need a soft measuring tape. Wrap it around the body without pulling it tight or leaving it loose. The tape should sit flat against the skin or a thin layer of clothing.

Don’t measure over bulky clothes, and try not to suck in your stomach or change your posture when measuring. A natural standing position gives you the most accurate numbers. If you’re measuring yourself, it can help to have someone else hold the tape so you get consistent tension all the way around.

Measurements You Need To Size a Wetsuit Properly

Choosing the right wetsuit size starts with identifying which measurements matter most for the specific suit you’re buying. Most wetsuit size charts ask for some combination of the following:

• Height
• Weight
• Chest (measured around the fullest part, tape kept level)
• Waist (measured at the natural waistline)
• Hips (measured around the fullest part of the hips and seat)
• Inseam (for suits that cover the legs, measured from the crotch to the ankle)

Some full wetsuit charts also use torso length or girth, so follow the brand’s instructions for where to start and end the tape. Not every chart uses torso length, but it’s worth knowing if you have an unusually long or short torso.

How To Choose a Wetsuit Size

Once you have your measurements, compare them against the brand’s size chart. If your measurements point clearly to one size, that size is usually the best starting point for that brand and style. 

Choose Between Two Wetsuit Sizes

Falling between sizes is common. For full wetsuits, start with the size that best matches your chest and torso length because those areas affect the seal, shoulder movement, and overall comfort most. Then check height and weight; if they fall far outside that size’s range, compare the next size up or down before choosing one.

For wetsuit bottoms or shorts, choose the size that best fits your hips and seat first, then make sure the waist will still sit securely without digging in or gapping. 

Fit notes on the product page can also help. A note like “size up if you’re between sizes and prioritize chest room” can guide you away from a size that might be too small. 

How a Wetsuit Should Fit

A well-fitting wetsuit should feel snug when it’s dry, almost like a second skin. That might feel surprising at first, especially if you’re used to looser activewear. The snugness is intentional because it limits how much water can enter and flush through the suit, which is what keeps you warm in cold water.

You should still be able to move your arms and shoulders, bend your knees, and rotate your torso without the suit pulling or cutting off circulation. If you feel numbness, restricted breathing, or significant pain, the suit is too tight. Large gaps, bunching fabric, or sagging areas are signs that the suit is too loose and won’t perform the way it should.

Youth Wetsuit Size Guide

Youth wetsuit sizing should be based on current body measurements, never age alone. Youth sizes vary by brand, and kids who are the same age can have very different measurements. 

Check whether the zipper is easy for the child to manage and whether the suit feels comfortable when they squat, reach, and bend. Avoid sizing up too much to account for growing room. If the child is between sizes, choose the size that keeps the suit close to the body without making it hard to move or breathe.

Proper Sizing When There Isn’t a Wetsuit Size Chart

If a wetsuit product page doesn’t have a clear size chart, don’t choose a size based on guesswork alone. Start by checking the brand’s main size guide, then compare your height, weight, chest, waist, hips, and torso measurements against the closest available chart.

Product reviews can give extra fit clues, especially when shoppers share their height, weight, and the size they bought. Customer support can also help confirm whether a wetsuit tends to run small, large, short, or long. 

If the brand doesn’t provide enough sizing information, it may be best to find a wetsuit from a different brand. At the very least, look for a retailer with a fair exchange policy because you may have to return the suit. 

Simplify Wetsuit Sizing on Your Shopify Store With Kiwi Sizing

Wetsuit sizing can trip up even experienced shoppers, and when customers land on the wrong size, they return the product and sometimes don’t come back. If you sell wetsuits or other technical sportswear on Shopify, adding clear size charts and measuring guides on your product pages can go a long way toward reducing those issues.

Kiwi Sizing helps Shopify merchants build branded, product-specific size charts that are easy to update and even easier for customers to use. From unit conversion to AI-powered size recommendations, Kiwi gives shoppers what they need to choose the right size with confidence. 

Install the Shopify sizing app and make accurate wetsuit sizing one less thing your customers have to guess at.