Do You Really Need a Wetsuit for a Sprint Triathlon?

Short answer: It depends on water temperature and your comfort level. Here’s when you need one, when you don’t, and what to consider.

When a wetsuit is required or strongly recommended

Water temperature below 60°F (15°C): Most races require wetsuits for safety.
Water temperature 60–65°F (15–18°C): Strongly recommended; you’ll be much more comfortable.
Open water swims: Even in warmer water, a wetsuit provides buoyancy and protection.

When you can skip it

Water temperature above 78°F (26°C): Wetsuits are often prohibited by race rules.
Pool swims: No wetsuit needed (and usually not allowed).
Warm, calm water: If you’re a strong swimmer and water is 70°F+ (21°C+), you can skip it.

Benefits of wearing a wetsuit

Buoyancy: Helps you float better, which can improve your swim time.
Warmth: Keeps you warm in cold water, preventing hypothermia.
Protection: Reduces chafing and provides some protection from jellyfish/seaweed.
Speed: Can make you faster due to improved body position and buoyancy.

Drawbacks

Cost: Good wetsuits cost $200–500+.
Transition time: Takes time to remove in T1 (practice helps).
Restriction: Can feel tight and restrict arm movement if not fitted properly.
Warm water: Can overheat you in warm conditions.

Renting vs. buying

Renting: Good option for your first race ($30–50). Try different brands/sizes.
Buying: Worth it if you plan to do multiple races or swim in cold open water regularly.

What to look for

Thickness: 3–5mm for triathlon (thicker = warmer but less flexible).
Fit: Should be snug but not constricting. Try before you buy.
Type: Full-sleeve (warmer) vs. sleeveless (more flexible). Full-sleeve is more common.

Practice before race day

Open water practice: Swim in your wetsuit in open water before race day.
T1 practice: Practice removing it quickly. Use body glide to prevent chafing.
Comfort: Make sure you can breathe and move comfortably.

Using The Next Race

Log open water swims and note water temperature and wetsuit use.
Track transition practice sessions to improve T1 speed.
Plan race-day gear based on expected water temperature.

Bottom line

For sprint triathlons, a wetsuit is usually worth it if water is below 70°F (21°C) or if you’re doing open water. If you’re doing pool-based sprints in warm water, you can skip it. When in doubt, check race rules and rent one for your first race to see how it feels.