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What To Wear For Your First Triathlon or Race
05.02.26

Signing up for your first triathlon or endurance race is exciting – and a little overwhelming. Between training plans, nutrition, and logistics, one of the most common questions beginners ask is:

“What should I wear for my first triathlon?”

The good news? You don’t need a closet full of expensive gear to get started. With a few key pieces of comfortable, functional clothing, you can feel confident, supported, and race-ready.

This beginner-friendly guide walks through what to wear for a triathlon (or multi-sport race), from swim to bike to run—plus helpful tips for choosing gear that fits your body, budget, and goals.

Start with the Right Base Layer

If you’re new to triathlon, the simplest option is a tri suit or a sports bra with tri shorts, designed to be worn for swim, bike, and run – no changing needed.

Look for quick-drying fabric, light padding for cycling, flat seams, and a snug but comfortable fit. For women, a high-quality sports bra is one of the most important investments.

👉 Our community loves the supportive, breathable options from MAAREE, which are designed for high-impact movement while staying comfortable across all three disciplines. We’ve also written a blog to help you find your perfect fit.

Pro Tip: Try your race outfit during training sessions – not just on race day.

Swim: Keep It Simple

For most beginner triathlons:

  • A one-piece swimsuit or your tri suit works perfectly

  • Depending on the temperature of the water, our venues may require wetsuits.

Avoid loose or cotton-based swimwear, which can feel heavy and slow once wet.

If you don’t yet own all the gear, don’t stress – at most of our events, we offer rentals for wetsuits (and bikes), making it easier to try triathlon without a big upfront investment.

👉 Partners like Adventure Kit Hire make it easy to step into something comfortable for race weekend events without breaking the bank. 

Bike: Comfort + Function Matter

Cycling is typically the longest leg of a triathlon, so comfort is key.

If you’re wearing a tri suit or tri shorts, you’ll want:

  • Padded cycling shorts or tri shorts

  • Socks that wick moisture

  • Cycling shoes or athletic sneakers (depending on pedal type)

  • Cycling jersey to protect you from the sun

👉 Brands like Scimitar offer technical jerseys designed for airflow, movement, and comfort – great for beginners building their kit. They even have a Castle Race Series cycling jersey coming out very soon – keep your eye peels! 

Run: Light, Breathable Layers

For runs, stick with what feels best during training:

  • Moisture-wicking top or jersey

  • Lightweight running shorts or tri suit

  • Running shoes you’ve already broken in

Avoid anything new on race day – especially socks and shoes.

Sunglasses: More Than a Style Choice

Sunglasses protect your eyes from UV rays, wind, dust, and glare – especially on the bike and run.

Look for:

  • Secure, non-slip fit

  • Lightweight frames

  • Polarized lenses if possible

👉 SunGod offers sport-focused sunglasses designed to stay put and provide clear vision in changing light conditions.

Your Race Check List

Not sure if you’ve got everything covered?

Use this simple checklist to make sure you’re race-day ready. Whether you already own some gear or plan to take advantage of event rentals, this list will help you feel organised, confident, and prepared at the start line.

Get Your Race Checklist

Final Thoughts: Wear What Makes You Feel Confident

Your first triathlon isn’t about having the “perfect” kit – it’s about showing up, trying something new, and crossing the finish line.

Choose clothing that:

  • Feels good on your body

  • Supports your movement

  • Helps you focus on the experience, not your outfit

With the right basics (and a few trusted partners), you’ll be ready to race.