FAQs – Clothing for Triathlon

All of your questions about clothing for triathlon… answered!

Should I race in a one-piece trisuit or in a two-piece outfit?

Clothing For Triathlon FAQs

The one-piece trisuit is favoured by advanced triathletes because it saves one having to worry about one’s top riding up and offers aerodynamic benefits. It also has advantages in a pool based swim where you don’t wear a wet suit.

Novice triathletes often opt for a two-piece suit because it can make pre-race nerves related toilet issues so much easier to deal with. You also get a lot more use out of a two-piece as you will wear it more often in your training sessions. Should you decide on a two-piece outfit, remember that a tank top will give you more sun protection than a crop top.


What trisuit size should I buy?

When buying a one-piece trisuit, you need to consider your normal dress size and your height. Trigirl suits size S fit a UK 6-8, size M fit UK10-12 and size L fit UK14-16. However, if you are taller than average, you may need to buy a slightly larger size. If you are below average in height, a smaller size will fit you best. A trisuit must always fit snugly, without creases or excess material. So, if you find yourself between sizes, we recommend that you try the smaller size first. Of course, when buying online from us, you can always exchange your suit if you find you ordered the wrong size. Please see our size chart below for your reference.Clothing For Triathlon Size Chart

Why do I need triathlon specific clothing?

The main reason for buying a triathlon specific outfit for your race is that normal sports clothing such as running tops or gym shorts are made from heavier, slow-drying materials. They retain water and won’t dry as quickly as a tri-specific outfit, thus meaning that you run the risk of getting cold and uncomfortable on the bike. This may affect your performance or, in the worst case, result in you catching a cold.

In addition, clothing for triathlon has lots of technical features that will make your race a much more enjoyable experience. The chamois pad in the bottoms, for example, will protect your bum on the bike, while the leg gripper elastics will ensure your shorts don’t ride up when you pull your wetsuit over them.

I have a large bust, do I need to wear a sports bra?

Women with smaller cup sizes race without bras because a bra does not dry quickly and makes you feel uncomfortable. All our trisuit and tri-tops have an integrated support bra which will enable women with A cup, B cup and even C cup sizes to race without a bra. We recommend women with larger than C cup size to consider wearing a sports bra under their suit for more comfort during the run.

For more info about bras you might want to read our Triathlon Bra Tips.

Do I wear underwear under my tri suit?

The answer is no. You should not wear underwear (except a sports bra if needed) under your trisuit in a race. Your underwear would retain water and would counteract the quick drying properties of your suit.

Do I wear a trisuit for the whole of the race, even the swim? Do I wear it under my wetsuit? If not, how do I get changed?

Yes, a trisuit (one- or two-piece) is made for all aspects of your race, including the swim. Trigirl’s trisuits are made from special quick-drying fabric, so you won’t stay wet for long! The trisuits also have a flattering, streamlined fit, perfect for wearing under a wetsuit and on their own.