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Mariona Planella
August 17, 2025By Mariona Planella
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Road to Marathon #12 - What to Wear on Race Day (Fit Kit Guide)

TipsRoad to Berlin Marathon

🏁 What to Wear on Marathon Race Day: The Ultimate Fit Kit Guide

Marathon-tested tips to avoid chafing, overheating, and last-minute outfit regrets.

Race day is not the time for fashion risks or experimental gear. Whether you're running your first 42.2 km or chasing a new PB, what you wear can make or break your experience.

I completed my first ever marathon last year, and a few other races from various lengths and weather conditions, and I’ve learned this the hard way: your gear can seriously affect your mood, mindset and performance. From socks to sunglasses, every layer counts. So I’ve put together this no-BS, marathon-tested Fit Kit guide 😉 From shoes to socks, layers to lube, here’s how to make sure your race day fit doesn’t let you down.

Let’s dive in 👇

1. Start with the Right Shoes

Your shoes are your most critical piece of equipment. By race day, you should have at least 30–80 km on them; enough to ensure comfort but not so many that the cushioning is worn down.

👟 Tried-and-tested marathon shoes:

Pro tip: Don’t race in brand-new shoes. Break them in during a few tempo sessions or your long run.

2. Socks: Don't Underestimate Them

Spending €200+ on running shoes but neglecting your socks? Big mistake. The wrong pair can turn a great run into a blister-filled nightmare. Don’t let months of training go to waste over something so simple.

Socks matter, a lot. For long runs and recovery, I swear by compression socks. They boost circulation, reduce fatigue, and genuinely make a difference. My go-to? The FALKE Compression Knee Socks. Supportive, snug, and tested through every mile. Check them out here.

Pro tip: Choose technical, moisture-wicking fabric. And make sure they’ve been tested during long runs

3. Bottoms: Shorts or Tights? Pockets Yes or No?

Choose what you’ve worn for most of your long runs. Comfort and utility matter more than style. Personally, I don't like wearing a running vest or belt in races (as it adds up some weight). I prefer simple shorts with pockets to carry my essentials (phone and gels). I don't race with headphones (so no need to carry them either), nor water, as I rely on the refueling stations (usually, every 5k).

🩳 Favourite Bottoms

Pro tip: For girls with bigger thighs like mine, I recommend to use anti-chafe balm on inner thighs if wearing short shorts, or opting for “biker” shorts. Avoid cotton. Look for inner liners or compression for long-haul comfort.

A Secret: Last year I ran the Marathon in a pair of short tights from SheIn (slay!), and I couldn't be happier with the feeling. Figure out what works for you and your body type!

4. Top It Off: Race-Day Shirts or Singlets

Your shirt should be lightweight, moisture-wicking, fitted enough to prevent rubbing, but not too tight

👕 Favorites:

Pro tip: Pin your bib to the shirt before you put it on, especially if you're layering or nervous.

5. Layer Up (If Necessary)

The Marathon starts early, and in September, the weather is not too reliable. Last year, I remember it was only 6-7 degrees when I left the hotel, and I was freezing. A group of Singaporean runners kindly offered me one of their blankets while we were waiting in the corral. Don’t commit the same mistake and, be prepared! You don’t want to waste your body’s energy in keeping a stable body temperature as you’ll need this energy later.

🌡️ Smart layering ideas:

  • Old hoodie or long sleeve you can toss at the start line. All the clothes will be donated to charity :)
  • Decathlon Kalenji Arm Sleeves – Great for changing temps mid-race.
  • Lightweight gloves and a buff if it’s below 10°C

Pro tip: Some runners wear a trash bag to block wind while waiting in the corral (yes, seriously). It works!

6. Supportive Gear for Women

A good sports bra is non-negotiable. Look for high-impact support with minimal bounce.

🖤 Recommended:

Pro tip: Apply anti-chafe balm under bra lines—especially if it's hot and humid.

7. Accessories: Small but Crucial

  • Cap or visor: For sun, rain, or sweat control. Try Ciele, Nike AeroBill, or Buff Pack Run Cap.
  • Running belt, vest or shorts with built-in storage: For gels, salt tabs, or your phone.
  • Sunglasses: Choose something lightweight and bounce-free like Goodr, Oakley Sutro Lite, or Roka.
  • Watch: You already know: Garmin, Coros, or Apple Watch Ultra (just make sure it’s charged!).
  • Timing chip: If it’s separate from the bib, attach it to your shoe before race morning.

8. Don’t Forget the Anti-Chafe Balm

Apply generously: underarms, thighs, nipples (yes), waistband, sock lines, and anywhere your gear rubs. No one wants to suffer “marathon nipples” or surprise blisters.

9. Final Tips:

  • Weather check: Layer smartly, especially if the temperature will change during your race.
  • Fuel strategy: If you're carrying gels, make sure your kit has a way to store them securely.
  • Test everything: Race day is not for new gear. Do a full dress rehearsal at least 2 weeks out.

👟 Fit Kit Checklist:

✅ Shoes (broken-in, race-tested)

✅ Moisture-wicking socks

✅ Shorts/tights you’ve trained in

✅ Lightweight singlet or tee

✅ Sports bra (for women)

✅ Sunglasses, cap/visor

✅ Watch (charged)

✅ Anti-chafe balm

✅ Fuel/gels

✅ Throwaway layer or blanket (if cold)

Final Thoughts:

You’ve trained hard for this. Let your race kit support your performance, not sabotage it. The goal is to feel light, fast, and distraction-free from start to finish. So test your gear early, choose (YOUR) comfort over trend and remember: no surprises on race day!

Now go crush it. 🏅

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Road to Marathon #12 - What to Wear on Race Day (Fit Kit Guide) | Running FOMO Berlin Blog